Document and Entity Information (USD $)	12 Months Ended
Document and Entity Information (USD $)	Sep. 30, 2015	Nov. 23, 2015	Mar. 31, 2015
Document and Entity Information [Abstract]
Entity Registrant Name	DIGI INTERNATIONAL INC.
Entity Central Index Key	0000854775
Current Fiscal Year End Date	--09-30
Entity Filer Category	Accelerated Filer
Document Type	10-K
Document Period End Date	Sep. 30, 2015
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Common Stock, Shares Outstanding		25,299,260
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$ 246,475,812

Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Revenue:
Hardware product	$ 195,497	$ 172,846	$ 173,078
Service	17,361	19,855	22,303
Total revenue	212,858	192,701	195,381
Cost of sales:
Cost of hardware product	101,155	85,737	82,276
Cost of service	13,672	16,480	12,982
Total cost of sales	114,827	102,217	95,258
Gross profit	98,031	90,484	100,123
Operating expenses:
Sales and marketing	39,544	40,576	40,513
Research and development	32,047	29,789	30,327
General and administrative	19,514	19,913	21,423
Restructuring charges, net	509	81	313
Total operating expenses	91,614	90,359	92,576
Operating income	6,417	125	7,547
Other income, net:
Interest income	218	176	210
Interest expense	(4)	(5)	(42)
Other income, net	2,014	501	523
Total other income, net	2,228	672	691
Income before income taxes	8,645	797	8,238
Income tax provision (benefit)	2,057	(954)	2,433
Net income	$ 6,588	$ 1,751	$ 5,805
Net income per common share:
Basic (USD per share)	$ 0.27	$ 0.07	$ 0.22
Diluted (USD per share)	$ 0.26	$ 0.07	$ 0.22
Weighted average common shares:
Basic (shares)	24,645	25,345	25,956
Diluted (shares)	25,227	25,730	26,237

Consolidated Statement of Comprehensive Income (Loss) (USD $)
In Thousands, unless otherwise specified

12 Months Ended

Sep. 30, 2015

Sep. 30, 2014

Sep. 30, 2013

Statement of Comprehensive Income [Abstract]

Net income

$ 6,588

$ 1,751

$ 5,805

Other comprehensive loss, net of tax:

Foreign currency translation adjustment

(4,323)

(2,713)

(1,826)

Change in net unrealized (loss) gain on investments

(21)

(63)

Less income tax benefit (provision)

(17)

Reclassification of realized loss on investments included in net income

^[1]

Other comprehensive loss, net of tax

(4,336)

(2,687)

(1,865)

Comprehensive income (loss)

$ 2,252

$ (936)

$ 3,940

[1]	Recorded in Other income, net in our Consolidated Statements of Operations.

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References+ Details

Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 30, 2015	Sep. 30, 2014
Current assets:
Cash and cash equivalents	$ 45,018	$ 47,490
Marketable securities	47,191	32,898
Accounts receivable, net	29,205	28,576
Inventories	31,877	31,247
Deferred tax assets	3,379	3,221
Other	3,515	4,249
Total current assets	160,185	147,681
Marketable securities, long-term	13,626	11,541
Property, equipment and improvements, net	14,357	13,231
Identifiable intangible assets, net	4,179	6,785
Goodwill	102,097	103,398
Deferred tax assets	5,666	7,383
Other	250	440
Total assets	300,360	290,459
Current liabilities:
Accounts payable	6,723	10,451
Income taxes payable	828	0
Accrued compensation	11,502	8,133
Other	4,136	3,170
Total current liabilities	23,189	21,754
Income taxes payable	1,546	2,724
Deferred tax liabilities	135	272
Other noncurrent liabilities	552	411
Total liabilities	25,422	25,161
Commitments and Contingencies (see Notes 15 & 16)
Stockholders’ equity:
Preferred stock, $.01 par value; 2,000,000 shares authorized; none issued and outstanding	0	0
Common stock, $.01 par value; 60,000,000 shares authorized; 31,534,198 and 30,703,895 shares issued	315	307
Additional paid-in capital	227,367	218,689
Retained earnings	124,404	117,816
Accumulated other comprehensive loss	(22,613)	(18,277)
Treasury stock, at cost, 6,487,248 and 6,313,937 shares	(54,535)	(53,237)
Total stockholders’ equity	274,938	265,298
Total liabilities and stockholders’ equity	$ 300,360	$ 290,459

Consolidated Balance Sheets (Parenthetical) (USD $)	Sep. 30, 2015	Sep. 30, 2014
Statement of Financial Position [Abstract]
Preferred stock, par value (USD per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized	2,000,000	2,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value (USD per share)	$ 0.01	$ 0.01
Common stock, shares authorized	60,000,000	60,000,000
Common stock, shares issued	31,534,198	30,703,895
Treasury stock, shares	6,487,248	6,313,937

Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Operating activities:
Net income	$ 6,588	$ 1,751	$ 5,805
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of property, equipment and improvements	2,949	3,557	3,461
Amortization of identifiable intangible assets	2,910	3,589	4,416
Stock-based compensation	4,301	4,330	3,773
Excess tax benefits from stock-based compensation	0	(44)	(67)
Deferred income tax benefit	(769)	(2,783)	(2,055)
Gain on insurance settlement related to property and equipment	(1,375)	0	0
Bad debt/product return provision	357	98	811
Inventory obsolescence	1,284	860	1,258
Intangible impairment charge	0	0	361
Restructuring charges, net	509	81	313
Other	87	3	(85)
Changes in operating assets and liabilities (net of acquisition):
Accounts receivable	(1,794)	(2,730)	(2,368)
Inventories	(1,913)	(5,966)	(2,972)
Other assets	241	210	(212)
Income taxes	387	(1,408)	(2,634)
Accounts payable	(3,769)	970	1,413
Accrued expenses	4,081	(709)	530
Net cash provided by operating activities	14,074	1,809	11,748
Investing activities:
Purchase of marketable securities	(54,427)	(27,420)	(67,159)
Proceeds from maturities of marketable securities	38,028	47,420	63,089
Acquisition of businesses, net of cash acquired	0	0	(12,919)
Proceeds from insurance settlement related to property and equipment	1,400	0	0
Proceeds from sale of property and equipment	45	0	0
Proceeds from sale of investment	0	0	136
Purchase of property, equipment, improvements and certain other intangible assets	(4,500)	(3,421)	(2,886)
Net cash (used in) provided by in investing activities	(19,454)	16,579	(19,739)
Financing activities:
Excess tax benefits from stock-based compensation	0	44	67
Proceeds from stock option plan transactions	6,559	3,689	2,193
Proceeds from employee stock purchase plan transactions	925	1,009	1,008
Purchase of common stock	(2,339)	(15,702)	(14,058)
Net cash provided by (used in) financing activities	5,145	(10,960)	(10,790)
Effect of exchange rate changes on cash and cash equivalents	(2,237)	(1,258)	(145)
Net (decrease) increase in cash and cash equivalents	(2,472)	6,170	(18,926)
Cash and cash equivalents, beginning of period	47,490	41,320	60,246
Cash and cash equivalents, end of period	45,018	47,490	41,320
Supplemental disclosures of cash flow information:
Interest paid	4	5	42
Income taxes paid, net	1,296	3,197	6,300
Supplemental schedule of non-cash investing and financing activities:
Accrual for capitalized intangible asset	17	0	42
Issuance of common stock for business acquisition	0	0	6,741
Accrual for purchase of common stock	$ 0	$ 100	$ 0

Consolidated Statements of Stockholders' Equity (USD $) In Thousands, except Share data, unless otherwise specified	Total	Common Stock	Treasury Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss
Beginning balance at Sep. 30, 2012	$ 270,834	$ 293	$ (25,489)	$ 199,495	$ 110,260	$ (13,725)
Beginning balance (in shares) at Sep. 30, 2012		29,269,000	3,356,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	5,805				5,805
Other comprehensive loss	(1,865)					(1,865)
Employee stock purchase issuances (in shares)			(128,000)
Employee stock purchase issuances	1,008		1,030	(22)
Repurchase of common stock (in shares)			1,481,000
Repurchase of common stock	(14,058)		(14,058)
Issuance of stock upon exercise of stock options (in shares)		280,000
Issuance of stock upon exercise of stock options	2,193	3		2,190
Tax impact from equity awards	(188)			(188)
Acquisition of Etherios, Inc. (in shares)		715,000
Acquisition of Etherios, Inc.	6,741	7		6,734
Stock-based compensation expense	3,773			3,773
Ending balance at Sep. 30, 2013	274,243	303	(38,517)	211,982	116,065	(15,590)
Ending balance (in shares) at Sep. 30, 2013		30,264,000	4,709,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,751				1,751
Other comprehensive loss	(2,687)					(2,687)
Employee stock purchase issuances (in shares)			(129,000)
Employee stock purchase issuances	1,009		1,082	(73)
Repurchase of common stock (in shares)			1,734,000
Repurchase of common stock	(15,802)		(15,802)
Issuance of stock under stock award plans (in shares)		440,000
Issuance of stock under stock award plans	3,689	4		3,685
Tax impact from equity awards	(1,235)			(1,235)
Stock-based compensation expense	4,330			4,330
Ending balance at Sep. 30, 2014	265,298	307	(53,237)	218,689	117,816	(18,277)
Ending balance (in shares) at Sep. 30, 2014		30,704,000	6,314,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	6,588				6,588
Other comprehensive loss	(4,336)					(4,336)
Employee stock purchase issuances (in shares)			(124,000)
Employee stock purchase issuances	925		1,041	(116)
Repurchase of common stock (in shares)			297,000
Repurchase of common stock	(2,339)		(2,339)
Issuance of stock under stock award plans (in shares)		830,000
Issuance of stock under stock award plans	6,559	8		6,551
Tax impact from equity awards	(2,058)			(2,058)
Stock-based compensation expense	4,301			4,301
Ending balance at Sep. 30, 2015	$ 274,938	$ 315	$ (54,535)	$ 227,367	$ 124,404	$ (22,613)
Ending balance (in shares) at Sep. 30, 2015		31,534,000	6,487,000

Summary of Significant Accounting Policies

12 Months Ended

Sep. 30, 2015

Accounting Policies [Abstract]

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Business Description

We are a leading provider of Internet of Things (IoT) networking hardware products and solutions that enable the connection, monitoring and control of local or remote physical assets by electronic means. These networking products and solutions can connect communication hardware to a physical asset, convey information about the asset’s status and performance to a computer system and then use that information to improve or automate one or more processes. These products and solutions are deployed via both wired and, ever increasingly wireless networks. Our solutions are deployed by a wide range of businesses and institutions. Any business that utilizes a significant number of devices, whose operation could benefit from remote monitoring or control, may realize benefits from IoT networking.

Principles of Consolidation

The consolidated financial statements include our accounts and the accounts of our wholly-owned subsidiaries. All intercompany accounts and transactions have been eliminated in consolidation.

Cash Equivalents

Cash equivalents consist of money market accounts and other highly liquid investments purchased with an original maturity of three months or less. The carrying amounts approximate fair value due to the short maturities of these investments.

Marketable Securities

Marketable securities consist of certificates of deposit, commercial paper, corporate bonds and government municipal bonds. All marketable securities are accounted for as available-for-sale and are carried at fair value on our consolidated balance sheets with unrealized gains and losses recorded in accumulated other comprehensive loss within stockholders’ equity. In order to estimate the fair value for each security in our investment portfolio, we obtain quoted market prices and trading activity for each security where available. We obtain relevant information from our investment advisor and, if warranted, also may review the financial solvency of certain security issuers.

We regularly monitor and evaluate the value of our marketable securities. When assessing marketable securities for other-than-temporary declines in value, we consider several factors. These factors include: how significant the decline in value is as a percentage of the original cost, how long the market value of the investment has been less than its original cost, the underlying factors contributing to a decline in the prices of securities in a single asset class, the performance of the issuer’s stock price in relation to the stock price of its competitors within the industry, expected market volatility, analyst recommendations, the views of external investment managers, any news or financial information that has been released specific to the investee and the outlook for the overall industry in which the issuer operates. If events and circumstances indicate that a decline in the value of a security has occurred and is other-than-temporary, we would record a charge to other income (expense).

Accounts Receivable

Accounts receivable are stated at the amount we expect to collect, which is net of an allowance for doubtful accounts for estimated losses resulting from the inability of our customers to make required payments. The following factors are considered when determining the collectability of specific customer accounts: customer creditworthiness, past transaction history with the customer, and changes in customer payment terms or practices. In addition, overall historical collection experience, current economic industry trends, and a review of the current status of trade accounts receivable are considered when determining the required allowance for doubtful accounts. Based on our assessment, we provide for estimated uncollectible amounts through a charge to earnings and a credit to our allowance for doubtful accounts. Balances that remain outstanding after we have used reasonable collection efforts are written off through a charge to the allowance for doubtful accounts and a credit to accounts receivable.

Inventories

Inventories are stated at the lower of cost or fair market value, with cost determined using the first-in, first-out method. Appropriate consideration is given to deterioration, obsolescence and other factors in evaluating fair market value.

1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)

Property, Equipment and Improvements, Net

Property, equipment and improvements are carried at cost, net of accumulated depreciation. Depreciation is provided by charges to operations using the straight-line method over the estimated asset useful lives. Furniture and fixtures and other equipment are depreciated over a period of three to five years. Building improvements and buildings are depreciated over ten and thirty-nine years, respectively.

Expenditures for maintenance and repairs are charged to operations as incurred, while major renewals and betterments are capitalized. The assets and related accumulated depreciation accounts are adjusted for asset retirements and disposals with the resulting gain or loss included in operations.

Identifiable Intangible Assets

Purchased proven technology, license agreements, covenants not to compete and other identifiable intangible assets are recorded at fair value when acquired in a business acquisition, or at cost when not purchased in a business acquisition. Purchased in-process research and development costs (IPR&D) related to business combinations are capitalized and amortized once placed in service. All other identifiable intangible assets are amortized on either a straight-line basis over their estimated useful lives of three to thirteen years or based on the pattern in which the asset is consumed. Useful lives for identifiable intangible assets are estimated at the time of acquisition based on the periods of time from which we expect to derive benefits from the identifiable intangible assets. Amortization of purchased and core technology is included in cost of product in the Consolidated Statements of Operations. Amortization of all other acquired identifiable intangible assets is charged to operating expenses as a component of general and administrative expense.

Identifiable intangible assets are reviewed for impairment annually or whenever events or circumstances indicate that undiscounted expected future cash flows are not sufficient to recover the carrying value amount. We measure impairment loss by utilizing an undiscounted cash flow valuation technique using fair values indicated by the income approach. Impairment losses, if any, would be recorded in the period the impairment is identified. During the fourth quarter of fiscal 2013, we recorded an impairment charge of $0.4 million which was included in general and administrative expense on our Consolidated Statements of Operations for our single operating and reporting segment (see Note 4 to our Consolidated Financial Statements). There was an immaterial amount of impairments identified in fiscal 2015 and no impairments identified during fiscal 2014.

Goodwill

Goodwill represents the excess of cost over the fair value of identifiable assets acquired. Goodwill is tested for impairment on an annual basis as of June 30, or more frequently if events or circumstances occur which could indicate impairment. The calculation of goodwill impairment requires us to make assumptions about the fair value of our one reporting unit, which historically has been approximated by using our market capitalization plus a control premium. Control premium assumptions require judgment and actual results may differ from assumed or estimated amounts.

Our test for potential goodwill impairment is a two-step approach. We estimate the fair value for our one reporting unit by comparing its fair value (market capitalization plus control premium) to our carrying value. If the carrying value of the reporting unit exceeds its estimated fair value, the second step of the goodwill impairment analysis requires us to measure the amount of the impairment loss. An impairment loss is calculated by comparing the implied fair value of the goodwill to its carrying amount. To calculate the implied fair value of goodwill, the fair value of the reporting unit's assets and liabilities, excluding goodwill, is estimated. The excess of the fair value of the reporting unit over the amount assigned to its assets and liabilities, excluding goodwill, is the implied fair value of the reporting unit's goodwill.

In June 2014, we performed a control premium study to determine the appropriate control premium to include in the calculation of fair value. We used a third party valuation firm to assist us in performing the control premium analysis. In order to estimate the range of control premiums appropriate for us, the following three methodologies were used: (1) analysis of individual transactions within our industry; (2) analysis of industry-wide data, and (3) analysis of global transaction data. Individual transactions in the Communication Equipment or Technology Hardware, Storage and Peripherals industries were used to find transactions of target companies that operated in similar markets and shared similar operating characteristics with us.

1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)

Transaction screening criteria included selection of transactions with the following characteristics:

•At least 50 percent of a target company’s equity sought by an acquirer,

•Target company considered operating (not in bankruptcy),

•Target company had publicly traded stock outstanding at the transaction date, and


•	Transactions announced between June 30, 2009 and the valuation date.

In analyzing industry-wide data, transactions in the following three industries were identified that encompassed the products offered by us: Office Equipment and Computer Hardware, Communications, and Computer, Supplies and Services. Finally, control premiums were considered for both domestic and international transactions. The control premium analysis resulted in a range of control premium of 30% to 40%. We re-evaluated the data and concluded that a 35% control premium continues to best represent the amount an investor would likely pay, over and above market capitalization, in order to obtain a controlling interest given the economic conditions at June 30, 2015.

Based on our industry knowledge, including recent industry merger and acquisition activity, we concluded that a 35% control premium continues to be appropriate to use for our June 30, 2015 goodwill impairment assessment.

At June 30, 2015, our market capitalization was $238.6 million compared to our carrying value of $270.6 million. Our market capitalization plus our estimated control premium of 35% resulted in a fair value in excess of our carrying value by a margin of 19%. As a result, no goodwill impairment was indicated and we were not required to complete the second step of the goodwill impairment analysis. No goodwill impairment charges were recorded. During the fourth quarter of fiscal 2015, we assessed various qualitative factors to determine whether or not an additional goodwill impairment assessment was required as of September 30, 2015, and we concluded that no additional impairment assessment was required.

As of June 30, 2014, our market capitalization was $235.8 million compared to our carrying value of $273.0 million. Our market capitalization plus our estimated control premium of 35% resulted in a fair value in excess of our carrying value by a margin of 17% and therefore no impairment was indicated.

We continue to monitor our stock price on a daily basis. If the stock price remained below certain thresholds for a significant period of time, we would complete an interim impairment assessment. We also monitor other events or circumstances that could have a significant impact on our operations. If one of these events or circumstances were to occur, we would evaluate whether an interim goodwill impairment assessment should be completed.

If our stock price or control premium declines, the first step of our goodwill impairment analysis may fail. We have identified factors that could result in additional interim goodwill impairment testing; for example, we would perform the second step of the impairment testing if our stock price fell below certain thresholds for a significant period of time, or if our control premium significantly decreased. Events or circumstances may occur that could negatively impact our stock price, including changes in our anticipated revenue and profits and our ability to execute on our strategies. In addition, our control premium could decline due to changes in economic conditions, in the technology industry, in the financial markets or more generally. An impairment could have a material effect on our consolidated balance sheet and results of operations. We have had no goodwill impairment losses since the adoption of Accounting Standards Codification (ASC) 350, Intangibles-Goodwill and Others, in fiscal 2003.

Warranties

In general, we warrant our hardware products to be free from defects in material and workmanship under normal use and service. The warranty periods generally range from one to five years. We typically have the option to either repair or replace hardware products we deem defective with regard to material or workmanship. Estimated warranty costs are accrued in the period that the related revenue is recognized based upon an estimated average per unit repair or replacement cost applied to the estimated number of units under warranty. These estimates are based upon historical warranty incidents and are evaluated on an ongoing basis to ensure the adequacy of the warranty accrual.

1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)

Revenue Recognition

We recognize revenue in accordance with authoritative guidance issued by FASB related to revenue recognition.

Hardware product revenue as a percentage of total revenue was 91.8%, 89.7% and 88.6% in fiscal 2015, 2014 and 2013, respectively. We recognize hardware product revenue when persuasive evidence of an arrangement exists, delivery has occurred, the sales price is fixed or determinable, collectability is reasonably assured and there are no post-delivery obligations, other than warranty. Under these criteria, product revenue generally is recognized upon shipment of product to customers.

Sales to authorized domestic and foreign distributors and Direct / OEMs are made with certain rights of return and price adjustment provisions. Estimated reserves for future returns and pricing adjustments are established by us based on an analysis of historical patterns of returns and price adjustments as well as an analysis of authorized returns compared to received returns and distribution sales for the current period. Estimated reserves for future returns and price adjustments are charged against revenue in the same period as the corresponding revenue is recorded.

Service revenue as a percentage of total revenue represented 8.2%, 10.3% and 11.4% in fiscal 2015, 2014 and 2013, respectively. Our service revenue is derived primarily from professional and engineering services performed by our Etherios customer relationship management (CRM) services and our wireless design services. We also have some service revenue that is derived from our Digi Device Cloud, which is a platform-as-a-service (PaaS) offering in which customers pay for services consumed in terms of devices being managed and monitored, or as a monthly service fee for access to information. In addition, we have small amounts of revenue from our enterprise support services. We recognize service revenue from our Etherios CRM services, wireless design services, and Device Cloud based upon performance, including final product delivery and customer acceptance. In addition, we recognize small amounts of revenue from and enterprise support services which is recognized over the life of the contract, and training as the services are performed.

Research and Development

Research and development costs are expensed when incurred. Research and development costs include compensation, allocation of corporate costs, depreciation, utilities, professional services and prototypes. Software development costs are expensed as incurred until the point that technological feasibility and proven marketability of the product are established. To date, the time period between the establishment of technological feasibility and completion of software development has been short, and no significant development costs have been incurred during that period. Accordingly, we have not capitalized any software development costs to date.

Income Taxes

Deferred income taxes are recognized for the tax consequences in future years of differences between the tax basis of assets and liabilities and their financial reporting amounts at each year end based on enacted tax laws and statutory tax rates applicable to the periods in which the differences are expected to affect taxable income. Income tax expense is equal to the tax payable for the period and the change during the period in deferred tax assets and liabilities and also changes in income tax reserves.

Stock-Based Compensation

Stock-based compensation expense represents the cost of employee services received in exchange for an award of equity instruments based on the grant date fair value of the award. This cost must be recognized over the period during which an employee is required to provide the service (usually the vesting period).

Foreign Currency Translation

Financial position and results of operations of our international subsidiaries are measured using local currencies as the functional currency, except for our Singapore location which uses the U.S. Dollar as its local currency. Assets and liabilities of these operations are translated at the exchange rates in effect at the end of each reporting period. For our larger international subsidiaries, statements of operations accounts are translated at the daily rate. For all other international subsidiaries, our statements of operations accounts are translated at the weighted average rates of exchange prevailing during each reporting period. Translation adjustments arising from the use of differing currency exchange rates from period to period are included in accumulated other comprehensive loss in stockholders’ equity. Gains and losses on foreign currency exchange transactions, as well as translation gains or losses on transactions denominated in currencies other than an entity’s functional currency, are reflected in the statement of operations. During fiscal 2015, 2014 and 2013, there were net transaction gains of $0.6 million,

1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)

$0.5 million and $0.4 million, respectively, that were recorded in other income (expense). We manage our net asset or net liability position for U.S. dollar accounts in our foreign locations to reduce our foreign currency risk. We have not implemented a formal hedging strategy.

Net Income Per Common Share

Basic net income per common share is calculated based on the weighted average number of common shares outstanding during the period. Diluted net income per common share is computed by dividing net income by the weighted average number of common and potentially dilutive common shares outstanding during the period. Potentially dilutive common shares of our stock result from dilutive common stock options and restricted stock units. We use the treasury stock method to calculate the weighted-average shares used in the diluted earnings per share computation. Under the treasury stock method, the proceeds from exercise of an option, the amount of compensation cost, if any, for future service that we have not yet recognized, and the amount of estimated tax benefits that would be recorded in paid-in capital, if any, when the option is exercised are assumed to be used to repurchase shares in the current period.

The following table is a reconciliation of the numerators and denominators in the net income per common share calculations (in thousands, except per common share data):



	Fiscal years ended September 30,
	2015		2014		2013
Numerator:
Net income	$	6,588	$	1,751	$	5,805
Denominator:
Denominator for basic net income per common share — weighted average shares outstanding	24,645		25,345		25,956
Effect of dilutive securities:
Stock options and restricted stock units	582		385		281
Denominator for diluted net income per common share — adjusted weighted average shares	25,227		25,730		26,237
Net income per common share, basic	$	0.27	$	0.07	$	0.22
Net income per common share, diluted	$	0.26	$	0.07	$	0.22

Because their effect would be anti-dilutive at period end, certain potentially dilutive shares related to stock options to purchase common shares were excluded in the above computation of diluted earnings per share because the options’ exercise prices were greater than the average market price of our common shares. At September 30, 2015, 2014 and 2013, such excluded stock options were 3,016,911, 3,284,993 and 3,939,541, respectively.

Use of Estimates and Risks and Uncertainties

The preparation of consolidated financial statements in conformity with generally accepted accounting principles in the United States requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amount of revenue and expenses during the reporting period. Actual results could differ from those estimates. Estimates that could significantly affect our results of operations or financial condition involve the assignment of fair values upon acquisition of goodwill and other intangible assets and testing for impairment; the determination of our allowance for doubtful accounts and reserve for future returns and pricing adjustments; the estimation of our inventory obsolescence, warranty reserve, income tax reserves and other contingencies.

Comprehensive Income (Loss)

Our comprehensive income (loss) is comprised of net income, foreign currency translation adjustments and unrealized gains and losses on available-for-sale marketable securities, which are charged or credited to the accumulated other comprehensive loss account in stockholders’ equity.

1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)

Recent Accounting Developments

Adopted

In July 2013, the Financial Accounting Standards Board (“FASB”) issued ASU 2013-11, “Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists.” This guidance relates to the presentation of an unrecognized tax benefit when a net operating loss carryforward, a similar tax loss, or a tax credit carryforward exists. The standard update provides that a liability related to an unrecognized tax benefit should be offset against same jurisdiction deferred tax assets for a net operating loss carryforward, a similar tax loss, or a tax credit carryforward if such settlement is required or expected in the event the uncertain tax position is disallowed. This guidance was effective prospectively for fiscal years (and interim reporting periods within those years) beginning after December 15, 2013. We adopted this guidance during the fiscal quarter ended December 31, 2014, resulting in a reclassification of $0.4 million of unrecognized tax benefits to noncurrent deferred tax assets.

In March 2013, FASB issued ASU 2013-05, “Foreign Currency Matters (Topic 830): Parent’s Accounting for the Cumulative Translation Adjustment upon Derecognition of Certain Subsidiaries or Groups of Assets within a Foreign Entity or of an Investment in a Foreign Entity.” This guidance applies to the release of the cumulative translation adjustment into net income when a parent either sells a part or all of its investment in a foreign entity or no longer holds a controlling financial interest in a subsidiary or group of assets that is a business within a foreign entity. ASU 2013-05 was effective prospectively for fiscal years (and interim reporting periods within those years) beginning after December 15, 2013. We adopted this guidance during the fiscal quarter ended December 31, 2014. There was no impact on our condensed consolidated financial statements as we have not sold any foreign entities for which we hold a controlling financial interest.

Not Yet Adopted

In September 2015, FASB issued ASU 2015-16, "Simplifying the Accounting for Measurement-Period Adjustments." To simplify the accounting for adjustments made to provisional amounts recognized in a business combination, the amendments in this update eliminate the requirement to retrospectively account for those adjustments. The amendments in this update are effective for fiscal years beginning after December 15, 2015, including interim periods within those years, which for us will be the first fiscal quarter ending December 31, 2016. Earlier application is permitted for financial statements that have not been issued. We are currently evaluating the impact of the adoption of ASU 2015-16.

In July 2015, FASB issued ASU 2015-11, "Simplifying the Measurement of Inventory." This provision would require inventory that was previously recorded using first-in, first-out (FIFO) to lower of cost and net realizable value. Net realizable value is the estimated selling price in the ordinary course of business, less reasonably predictable costs of completion, disposal, and transportation. This guidance is effective for fiscal years beginning after December 15, 2016 and interim periods within those years, which for us will be the first fiscal quarter ending December 31, 2017. The amendments in this guidance should be applied prospectively with earlier application permitted as of the beginning of an interim or annual period. We are currently evaluating the impact of the adoption of ASU 2015-11 and whether it would have a material impact on our consolidated financial statements.

In April 2015, FASB issued ASU 2015-05, “Intangibles-Goodwill and Other-Internal-Use Software (Subtopic 350-40) - Customer’s Accounting for Fees Paid in a Cloud Computing Arrangement. The new standard provides guidance to customers about whether a cloud computing arrangement includes a software license. If the arrangement does include a software license, the software license element of the arrangement should be accounted for in the same manner as the acquisition of other software licenses. This guidance is effective for fiscal years, and interim periods within those years, beginning after December 15, 2015, with early adoption permitted. We expect to adopt this guidance beginning with our fiscal quarter ending December 31, 2016. We do not expect this guidance to have a material impact on our consolidated financial statements.

In August 2014, FASB issued ASU 2014-15, “Presentation of Financial Statements - Going Concern.” This guidance requires management to evaluate whether there is substantial doubt about a company’s ability to continue as a going concern and to provide related footnote disclosures. These amendments are effective for the annual period ending after December 15, 2016, and for annual periods and interim periods thereafter, which for us, will be the fourth fiscal quarter ended September 30, 2017. Early adoption is permitted. While we are evaluating the impact of the adoption of ASU 2014-15, we do not expect it to have an impact on our consolidated financial statements.

1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)

In May 2014, FASB issued ASU 2014-09, “Revenue from Contracts with Customers.” This guidance provides a five-step analysis in determining when and how revenue is recognized so that an entity will recognize revenue when it transfers promised goods or services to customers in an amount that reflects what it expects in exchange for the goods and services. It also requires more detailed disclosures to enable users of financial statements to understand the nature, amount, timing and uncertainty of revenue and cash flows arising from contracts with customers. In August 2015, the FASB issued ASU 2015-14 "Revenue from Contracts with Customers (Topic 606): Deferral of the Effective Date" which approved a one-year deferral of the effective date of ASU 2014-09. As a result of this deferral, ASU 2014-09 is effective for our fiscal 2019, including interim periods within that reporting period. The FASB also agreed to allow us to choose to adopt the standard effective for our fiscal 2018. We are assessing the adoption date and potential impact of adopting this ASU on our consolidated financial statements and related disclosures.

Acquisition	12 Months Ended
Acquisition	Sep. 30, 2015
Business Combinations [Abstract]
ACQUISITION	ACQUISITION Etherios, Inc. On October 31, 2012, we acquired Etherios, Inc. ("Etherios"). The total purchase price of $20.4 million included $13.7 million in cash (excluding cash acquired of $0.8 million) and $6.7 million represented by 715,571 shares of our common stock. The common stock issued was valued at $9.42 per common share. Cash in the amount of $2.35 million was deposited to an escrow fund with a third party agent. Of the $2.35 million escrow, $0.3 million related to a holdback amount pending final determination of the unpaid debt and working capital as shown on the closing balance sheet. This holdback amount was released to the sellers in February 2013 as there were no changes to the closing balance sheet. An additional $2.05 million was held in escrow in accordance with the terms of the stock purchase agreement until eighteen months after closing. These amounts were held in escrow to satisfy any claims that representations and warranties in the stock purchase agreement were not true. Ultimately, no claims were made and the escrow agent released these funds on April 30, 2014. The escrowed amounts were included in the determination of the purchase consideration on the date of acquisition as management expected that the representation and warranty matters were determinable beyond a reasonable doubt. The purchase price was allocated to the estimated fair value of assets acquired and liabilities assumed. During the fourth quarter of fiscal 2013, we recorded final purchase accounting entries that reduced the value of the common stock issued by $0.1 million to reflect the closing price on the date of the acquisition and we reduced the fair value of the net tangible assets acquired by $0.3 million. These adjustments resulted in an increase of $0.2 million in goodwill. The final purchase price allocation resulted in the recognition of $17.3 million of goodwill. The acquisition resulted in the recognition of goodwill primarily because Etherios is a salesforce.com Platinum Partner and experienced in end user implementation of the Salesforce Service Cloud. Although the relationship with salesforce.com was important to us, it was not an exclusive relationship and required Etherios to compete with others for business opportunities. Accordingly, we determined that this relationship could not be valued as a separate intangible asset of Etherios and as a result was a component of goodwill. As salesforce.com has signaled its intent for the Service Cloud to be used as a means to monitor machines, we determined the acquisition of Etherios likely would further enhance our solutions offerings and provide another channel for revenue of our networking products. Costs related to the acquisition, which included legal, accounting and valuation fees, in the amount of $0.2 million were charged directly to operations and were included in general and administrative expense in our Consolidated Statements of Operations for fiscal 2013. Etherios’ operating results were included in our Consolidated Results of Operations from the day following the acquisition on October 31, 2012. Because the Etherios acquisition was not material to our consolidated results of operations or financial position, pro forma financial information was not presented. On October 23, 2015, we entered into a stock purchase agreement with West Monroe Partners, LLC, in which they acquired all of the outstanding capital stock of our wholly owned subsidiary, Etherios, Inc. (see Note 18 to our Consolidated Financial Statements).

- Definition

The entire disclosure for a business combination (or series of individually immaterial business combinations) completed during the period, including background, timing, and recognized assets and liabilities. The disclosure may include leverage buyout transactions (as applicable).

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Goodwill and other Identifiable Intangible Assets

12 Months Ended

Sep. 30, 2015

Goodwill and Intangible Assets Disclosure [Abstract]

GOODWILL AND OTHER IDENTIFIABLE INTANGIBLE ASSETS, NET

Identifiable Intangible Assets, Net

Amortizable identifiable intangible assets, net as of September 30, 2015 and 2014 are comprised of the following (in thousands):



	September 30, 2015							September 30, 2014
	Gross carrying amount		Accum. amort.			Net		Gross carrying amount		Accum. amort.			Net
Purchased and core technology	$	45,449	$	(45,424	)	$	25	$	45,952	$	(45,162	)	$	790
License agreements	18		(4		)	14		2,440		(2,440		)	—
Patents and trademarks	11,817		(10,568		)	1,249		11,667		(9,799		)	1,868
Customer relationships	18,490		(16,057		)	2,433		18,894		(15,445		)	3,449
Non-compete agreements	1,100		(642		)	458		1,100		(422		)	678
Order backlog	—		—			—		360		(360		)	—
Total	$	76,874	$	(72,695	)	$	4,179	$	80,413	$	(73,628	)	$	6,785

During the fourth quarter of fiscal 2013, we recorded an impairment charge of $0.4 million in general and administrative expense on our Consolidated Statements of Operations for our single operating and reporting segment. Management determined to end-of-life certain product lines acquired in connection with the MobiApps acquisition due to various factors impacting the viability of these product lines. These products lines utilized certain identifiable intangible technology assets which were part of the assets purchased at the time of acquisition. The impairment charge consisted of $0.2 million for patented satellite technology and $0.1 million relating to an associated license agreement as the net carrying values of these intangible assets were not recoverable and the undiscounted future cash flows did not exceed the net carrying value of the assets. We also wrote off $0.1 million of various patents that were abandoned.

Amortization expense for fiscal years 2015, 2014 and 2013 is as follows (in thousands):



Fiscal year	Total
2015	$	2,910
2014	$	3,589
2013	$	4,416

Estimated amortization expense for the next five years is as follows (in thousands):



Fiscal year	Total
2016	$	1,944
2017	$	1,061
2018	$	487
2019	$	451
2020	$	168

Goodwill

The changes in the carrying amount of goodwill were (in thousands):



	Fiscal years ended September 30,
	2015			2014
Beginning balance, October 1	$	103,398		$	103,569
Foreign currency translation adjustment	(1,301		)	(171		)
Ending balance, September 30	$	102,097		$	103,398

- Definition

The entire disclosure for the aggregate amount of goodwill and a description of intangible assets, which may include (a) for amortizable intangible assets (also referred to as finite-lived intangible assets), the carrying amount, the amount of any significant residual value, and the weighted-average amortization period, (b) for intangible assets not subject to amortization (also referred to as indefinite-lived intangible assets), the carrying amount, and (c) the amount of research and development assets acquired and written off in the period, including the line item in the income statement in which the amounts written off are aggregated, if not readily apparent from the income statement. Also discloses (a) for amortizable intangibles assets in total and by major class, the gross carrying amount and accumulated amortization, the total amortization expense for the period, and the estimated aggregate amortization expense for each of the five succeeding fiscal years, (b) for intangible assets not subject to amortization the carrying amount in total and by major class, and (c) for goodwill, in total and for each reportable segment, the changes in the carrying amount of goodwill during the period (including the aggregate amount of goodwill acquired, the aggregate amount of impairment losses recognized, and the amount of goodwill included in the gain (loss) on disposal of a reporting unit). If any part of goodwill has not been allocated to a reportable segment, discloses the unallocated amount and the reasons for not allocating. For each impairment loss recognized related to an intangible asset (excluding goodwill), discloses: (a) a description of the impaired intangible asset and the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method for determining fair value, (c) the caption in the income statement or the statement of activities in which the impairment loss is aggregated, and (d) the segment in which the impaired intangible asset is reported. For each goodwill impairment loss recognized, discloses: (a) a description of the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method of determining the fair value of the associated reporting unit, and (c) if a recognized impairment loss is an estimate not finalized and the reasons why the estimate is not final. May also disclose the nature and amount of any significant adjustments made to a previous estimate of an impairment loss.

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Segment Information and Major Customers

12 Months Ended

Sep. 30, 2015

Segment Reporting [Abstract]

SEGMENT INFORMATION AND MAJOR CUSTOMERS

We operate under a single operating and reporting segment. Our revenue consists of hardware product revenue and service revenue. In an effort to provide further transparency of our financial information, we have expanded our hardware product categories for revenue reporting. Beginning with the first quarter of fiscal 2016, we will transition away from reporting revenue in terms of growth and mature hardware products and will report four product categories: Cellular routers and gateways, Radio Frequency (RF), Embedded and Network. We believe this is a more meaningful presentation and reflects how we are monitoring our revenue.

Our cellular product category includes cellular routers and all gateways, and the RF product category includes XBee^® modules as well as other RF solutions. The embedded product category includes Digi Connect^® and Rabbit^® embedded systems on module and single board computers. The network product category, which has the highest concentration of mature products, includes console and serial servers and USB connected devices.

Our service offerings include wireless product design and development services, CRM consulting services, application development services, our PaaS recurring revenue generated from Device Cloud platform, post-contract customer support and fees associated with enterprise support services.

The following table presents our revenue by our new product categories (in thousands):



	Fiscal years ended September 30,
	2015		2014		2013
Cellular routers and gateways	$	58,666	$	39,215	$	33,227
RF	34,373		29,094		29,157
Embedded	51,063		49,681		57,597
Network	51,395		54,856		53,097
Total product revenue	195,497		172,846		173,078
Service	17,361		19,855		22,303
Total revenue	$	212,858	$	192,701	$	195,381

The following table presents revenue for our growth and mature categories (in thousands):



	Fiscal years ended September 30,
	2014		2013		2012
Growth hardware products and all services	$	133,572	$	109,763	$	110,350
Mature hardware products	79,286		82,938		85,031
Total revenue	$	212,858	$	192,701	$	195,381

The information in the following table provides revenue by the geographic location of the customer for the fiscal years ended September 30, 2015, 2014 and 2013 (in thousands):



	Fiscal years ended September 30,
	2015		2014		2013
North America, primarily United States	$	136,603	$	116,421	$	116,541
Europe, Middle East & Africa	47,523		47,729		48,815
Asia	22,907		22,762		24,507
Latin America	5,825		5,789		5,518
Total revenue	$	212,858	$	192,701	$	195,381

4. SEGMENT INFORMATION AND MAJOR CUSTOMERS (CONTINUED)

Net property, equipment and improvements by geographic location are as follows (in thousands):



	Fiscal years ended September 30,
	2015		2014		2013
United States	$	14,103	$	12,813	$	13,321
International, primarily Europe	254		418		589
Total net property, equipment and improvements	$	14,357	$	13,231	$	13,910

Our U.S. export sales comprised 37.7% , 41.2% and 41.7% of revenue for the fiscal years ended September 30, 2015, 2014 and 2013. No single customer exceeded 10% of revenue for any of the periods presented. At September 30, 2015, we had two customers, whose accounts receivable balance comprised 10.2% and 11.0% of total accounts receivable. No single customer exceeded 10% of total accounts receivable at September 30, 2014.

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

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Marketable Securities

12 Months Ended

Sep. 30, 2015

Marketable Securities [Abstract]

MARKETABLE SECURITIES

Our marketable securities consist of certificates of deposit, commercial paper, corporate bonds and government municipal bonds. We analyze our available-for-sale marketable securities for impairment on an ongoing basis. When we perform this analysis, we consider factors such as the length of time and extent to which the securities have been in an unrealized loss position and the trend of any unrealized losses. We also consider whether an unrealized loss is a temporary loss or an other-than-temporary loss such as: (a) whether we have the intent to sell the security, or (b) whether it is more likely than not that we will be required to sell the security before its anticipated recovery, or (c) permanent impairment due to bankruptcy or insolvency.

In order to estimate the fair value for each security in our investment portfolio, we obtain quoted market prices and trading activity for each security where available. We obtain relevant information from our investment advisor and, if warranted, also

6. MARKETABLE SECURITIES (CONTINUED)

may review the financial solvency of certain security issuers. As of September 30, 2015, 44 of our 81 securities that we held were trading below our amortized cost basis. We determined each decline in value to be temporary based upon the above described factors. We expect to realize the fair value of these securities, plus accrued interest, either at the time of maturity or when the security is sold. All of our current holdings are classified as available-for-sale marketable securities and are recorded at fair value on our consolidated balance sheet with the unrealized gains and losses recorded in accumulated other comprehensive loss. All of our current marketable securities will mature in less than one year and our non-current marketable securities will mature in less than 3 years. We received proceeds from the sale of our available-for-sale marketable securities of $38.0 million, $47.4 million and $63.1 million for fiscal 2015, 2014 and 2013, respectively.

At September 30, 2015 our marketable securities were (in thousands):



	Amortized Cost (1)		Unrealized Gains		Unrealized Losses			Fair Value (1)
Current marketable securities:
Corporate bonds	$	31,753	$	—	$	(39	)	$	31,714
Commercial paper	7,986		—		(1		)	7,985
Certificates of deposit	6,253		8		—			6,261
Government municipal bonds	1,232		—		—			1,232
Current marketable securities	47,224		8		(40		)	47,192
Non-current marketable securities:
Corporate bonds	4,138		—		(13		)	4,125
Certificates of deposit	7,511		3		(7		)	7,507
Government municipal bonds	1,996		—		(3		)	1,993
Non-current marketable securities	13,645		3		(23		)	13,625
Total marketable securities	$	60,869	$	11	$	(63	)	$	60,817


(1)	Included in amortized cost and fair value is purchased and accrued interest of $252.

At September 30, 2014 our marketable securities were (in thousands):



	Amortized Cost (1)		Unrealized Gains		Unrealized Losses			Fair Value (1)
Current marketable securities:
Corporate bonds	$	24,668	$	1	$	(22	)	$	24,647
Commercial paper	3,998		—		(1		)	3,997
Certificates of deposit	4,252		2		—			4,254
Current marketable securities	32,918		3		(23		)	32,898
Non-current marketable securities:
Corporate bonds	2,051		—		(4		)	2,047
Certificates of deposit	9,502		14		(22		)	9,494
Non-current marketable securities	11,553		14		(26		)	11,541
Total marketable securities	$	44,471	$	17	$	(49	)	$	44,439


(1)	Included in amortized cost and fair value is purchased and accrued interest of $629.

6. MARKETABLE SECURITIES (CONTINUED)

The following tables show the fair values and gross unrealized losses of our available-for-sale securities that have been in a continuous unrealized loss position deemed to be temporary, aggregated by investment category (in thousands):



	September 30, 2015
	Less than 12 Months					More than 12 Months
	Fair Value		Unrealized Losses			Fair Value		Unrealized Losses
Corporate bonds	$	33,664	$	(52	)	$	—	$	—
Commercial paper	5,987		(1		)	—		—
Certificates of deposit	4,244		(6		)	499		(1		)
Government municipal bonds	3,159		(3		)	—		—
Total	$	47,054	$	(62	)	$	499	$	(1	)



	September 30, 2014
	Less than 12 Months					More than 12 Months
	Fair Value		Unrealized Losses			Fair Value		Unrealized Losses
Corporate bonds	$	23,475	$	(26	)	$	—	$	—
Commercial paper	3,998		(1		)	—		—
Certificates of deposit	2,980		(20		)	748		(2		)
Total	$	30,453	$	(47	)	$	748	$	(2	)

- Definition

The entire disclosure for investments in certain debt and equity securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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-URI http://asc.fasb.org/extlink&oid=6511694

+ Details

Fair Value Measurements

12 Months Ended

Sep. 30, 2015

Fair Value Disclosures [Abstract]

FAIR VALUE MEASUREMENTS

Fair value is defined as the amount that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants as of the measurement date. This standard also establishes a hierarchy for inputs used in measuring fair value. This standard maximizes the use of observable inputs and minimizes the use of unobservable inputs by requiring that the most observable inputs be used when available. Observable inputs are inputs market participants would use in valuing the asset or liability based on market data obtained from independent sources. Unobservable inputs are inputs that reflect our assumptions about the factors market participants would use in valuing the asset or liability based upon the best information available in the circumstances. The categorization of financial assets and liabilities within the valuation hierarchy is based upon the lowest level of input that is significant to the fair value measurement.

The hierarchy is broken down into the following three levels:


•	Level 1 — Inputs are quoted prices in active markets for identical assets or liabilities.


•	Level 2 — Inputs include quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, and inputs (other than quoted prices) that are observable for the asset or liability, either directly or indirectly.

•

Level 3 — Inputs are unobservable for the asset or liability and their fair values are determined using pricing models, discounted cash flow methodologies or similar techniques and at least one significant model assumption or input is unobservable. Level 3 may also include certain investment securities for which there is limited market activity or a decrease in the observability of market pricing for the investments, such that the determination of fair value requires significant judgment or estimation.

7. FAIR VALUE MEASUREMENTS (CONTINUED)

Fair value is applied to financial assets such as our marketable securities, which are classified and accounted for as available-for-sale. These items are stated at fair value at each reporting period using the above guidance. The following tables provide information by level for financial assets that are measured at fair value on a recurring basis (in thousands):



			Fair Value Measurements at September 30, 2015 using:
	Total carrying value at September 30, 2015		Quoted price in active markets (Level 1)		Significant other observable inputs (Level 2)		Significant unobservable inputs (Level 3)
Cash equivalents:
Money market	$	14,436	$	14,436	$	—	$	—
Available-for-sale marketable securities:
Corporate bonds	35,839		—		35,839		—
Commercial paper	7,985		—		7,985		—
Certificates of deposit	13,768		—		13,768		—
Government municipal bonds	3,225		—		3,225		—
Total cash equivalents and marketable securities measured at fair value	$	75,253	$	14,436	$	60,817	$	—



			Fair Value Measurements at September 30, 2014 using:
	Total carrying value at September 30, 2014		Quoted price in active markets (Level 1)		Significant other observable inputs (Level 2)		Significant unobservable inputs (Level 3)
Cash equivalents:
Money market	$	19,630	$	19,630	$	—	$	—
Available-for-sale marketable securities:
Corporate bonds	26,694		—		26,694		—
Commercial paper	3,997		—		3,997		—
Certificates of deposit	13,748		—		13,748		—
Total cash equivalents and marketable securities measured at fair value	$	64,069	$	19,630	$	44,439	$	—

Cash equivalents are measured at fair value using quoted market prices in active markets for identical assets and are therefore classified as Level 1 assets. We value our Level 2 assets using inputs that are based on market indices of similar assets within an active market. There were no transfers into or out of our Level 2 financial assets during the twelve months ended September 30, 2015.

We had no financial assets valued with Level 3 inputs as of September 30, 2015 nor did we purchase or sell any Level 3 financial assets during the twelve months ended September 30, 2015.

The use of different assumptions, applying different judgment to matters that are inherently subjective and changes in future market conditions could result in different estimates of fair value of our securities, currently and in the future. If market conditions deteriorate, we may incur impairment charges for securities in our investment portfolio.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References+ Details

Product Warranty Obligation

12 Months Ended

Sep. 30, 2015

Product Warranties Disclosures [Abstract]

PRODUCT WARRANTY OBLIGATION

The following table summarizes the activity associated with the product warranty accrual (in thousands) and is listed on our Consolidated Balance Sheets under Current Liabilities:



	Balance at		Warranties		Settlements			Balance at
Fiscal year	October 1		issued		made			September 30
2015	$	862	$	967	$	(815	)	$	1,014
2014	$	1,063	$	627	$	(828	)	$	862
2013	$	1,021	$	669	$	(627	)	$	1,063

We are not responsible for, and do not warrant that, custom software versions, created by original equipment manufacturer (OEM) customers based upon our software source code, will function in a particular way, will conform to any specifications or are fit for any particular purpose. Further, we do not indemnify these customers from any third-party liability as it relates to or arises from any customization or modifications made by the OEM customer.

Restructuring

12 Months Ended

Sep. 30, 2015

Restructuring and Related Activities [Abstract]

RESTRUCTURING

Below is a summary of the restructuring charges and other activity within the restructuring accrual (in thousands):



	2015 Restructuring			2014 Restructuring			2013 Restructuring			2012 Restructuring
	Employee Termination Costs			Employee Termination Costs			Employee Termination Costs			Employee Termination Costs			Other			Total
Balance at September 30, 2012	$	—		$	—		$	—		$	13		108			$	121
Restructuring charge	—			—			350			—			—			350
Payments	—			—			—			—			(84		)	(84		)
Reversals	—			—			—			(13		)	(24		)	(37		)
Balance at September 30, 2013	—			—			350			—			—			350
Restructuring charge	—			152			—			—			—			152
Payments	—			(152		)	(279		)	—			—			(431		)
Reversals	—			—			(71		)	—			—			(71		)
Balance at September 30, 2014	—			—			—			—			—			—
Restructuring charge	518			—			—			—			—			518
Payments	(509		)	—			—			—			—			(509		)
Reversals	(9		)	—			—			—			—			(9		)
Balance at September 30, 2015	$	—		$	—		$	—		$	—		$	—		$	—

2015 Restructuring

On February 20, 2015, we announced a restructuring plan related to our Etherios operations in order to refocus the business on CRM and service cloud implementations. We recorded a restructuring charge of $0.3 million related to severance during the second quarter of fiscal 2015. We scaled the business to expected revenue levels resulting in an elimination of approximately 21 positions. The payments associated with these charges were completed during the fourth quarter of fiscal 2015.

On January 22, 2015, we announced the closure of our India location. The March closure resulted in the elimination of approximately 38 employees from engineering, sales and administration. We recorded a restructuring charge of $0.2 million related to severance during the second quarter of fiscal 2015. The payments associated with this charge were completed during the third quarter of fiscal 2015.

9. RESTRUCTURING (CONTINUED)

2014 Restructuring

On October 31, 2013, we announced our intention to restructure certain of our operations in India. The restructuring was primarily associated with cost reduction initiatives resulting in the elimination of approximately 40 engineering and sales positions in our work force. We recorded a restructuring charge of 0.2 million related to severance during the first quarter of fiscal 2014. The payments associated with these charges and all the actions associated with the restructuring were completed during the third quarter of fiscal 2014.

2013 Restructuring

On September 27, 2013, we announced our intention to restructure certain of our operations in the U.S. The restructuring was primarily associated with cost reduction initiatives and resulted in the elimination of 15 positions in our work force. We recorded a restructuring charge of 0.4 million for severance during the fourth quarter of fiscal 2013. The payments associated with these charges and all the actions associated with the restructuring were completed during the first quarter of fiscal 2014.

2012 Restructuring

On April 26, 2012, we announced our intention to restructure certain of our operations. We recorded a $1.0 million restructuring charge. The restructuring related primarily to changes being implemented to focus on a shift in our business to more aggressively sell end-to-end IoT solutions. As a result of this restructuring, we eliminated employment positions in our work force of 30 employees at a cost of $0.6 million for severance. We also incurred expenses from vacating facilities in Davis, California and Huntington Beach, California at a cost of approximately $0.4 million. The payments associated with these charges and all the actions associated with the restructuring were completed by the second quarter of fiscal 2013.

- Definition

The entire disclosure for restructuring and related activities. Description of restructuring activities such as exit and disposal activities, include facts and circumstances leading to the plan, the expected plan completion date, the major types of costs associated with the plan activities, total expected costs, the accrual balance at the end of the period, and the periods over which the remaining accrual will be settled.

+ References+ Details

Income Taxes

12 Months Ended

Sep. 30, 2015

Income Tax Disclosure [Abstract]

INCOME TAXES

The components of income before income taxes are as follows (in thousands):



	Fiscal years ended September 30,
	2015		2014			2013
United States	$	2,462	$	(5,097	)	$	(395	)
International	6,183		5,894			8,633
Income before income taxes	$	8,645	$	797		$	8,238

The components of the income tax provision (benefit) are as follows (in thousands):



	Fiscal years ended September 30,
	2015			2014			2013
Current:
Federal	$	240		$	(309	)	$	1,418
State	308			(58		)	263
Foreign	2,278			2,196			3,148
Deferred:
U.S.	(566		)	(2,623		)	(2,270		)
Foreign	(203		)	(160		)	(126		)
Income tax provision (benefit)	$	2,057		$	(954	)	$	2,433

10. INCOME TAXES (CONTINUED)

The net deferred tax asset consists of the following (in thousands):



	As of September 30,
	2015			2014
Current deferred tax asset	$	3,379		$	3,221
Non-current deferred tax asset	5,666			7,383
Current deferred tax liability	(36		)	—
Non-current deferred tax liability	(135		)	(272		)
Net deferred tax asset	$	8,874		$	10,332

Uncollectible accounts and other reserves	$	1,075		$	1,023
Depreciation and amortization	190			276
Inventories	999			1,297
Compensation costs	7,148			8,606
Tax carryforwards	1,185			1,347
Valuation allowance	(862		)	(572		)
Identifiable intangible assets	(861		)	(1,645		)
Net deferred tax asset	$	8,874		$	10,332

As of September 30, 2015, we have estimated carryforwards for tax purposes as follows: We have $0.7 million of carryforwards mostly related to state research and development credits of tax credits and $0.5 million related to non-U.S. net operating losses. The majority of the state research and development tax credits and non-U.S. net operating losses have an unlimited carryforward period. The majority of our non-U.S. tax credit carryforwards will expire in 2027.

Our valuation allowance for certain U.S. and foreign locations increased to $0.9 million at September 30, 2015 from $0.6 million at September 30, 2014, due to foreign losses and limitations on current year state research and development credits. The amount of the deferred tax assets realized could vary if there are differences in the timing or amount of future reversals of existing deferred tax liabilities or changes in the amounts of future taxable income. If our future taxable income projections are not realized, an additional valuation allowance may be required, and would be reflected as income tax expense at the time that any such change in future taxable income is determined.

The reconciliation of the statutory federal income tax amount to our income tax provision (benefit) is as follows (in thousands):



	Fiscal years ended September 30,
	2015			2014			2013
Statutory income tax amount	$	2,939		$	271		$	2,801
Increase (decrease) resulting from:
State taxes, net of federal benefits	(222		)	(281		)	(32		)
Utilization of tax credits	(250		)	(76		)	(601		)
Manufacturing deduction	(285		)	(92		)	(65		)
Discrete tax benefits	(845		)	(1,470		)	(863		)
Foreign operations	181			316			166
Valuation reserve	297			11			65
Adjustment of tax contingency reserves	71			168			800
Meals and entertainment	93			99			80
Employee stock purchase plan	76			85			77
Other, net	2			15			5
Income tax provision (benefit)	$	2,057		$	(954	)	$	2,433

10. INCOME TAXES (CONTINUED)

During fiscal 2015, we recorded net tax benefits of $0.9 million resulting from the reinstatement of the research and development tax credit for calendar year 2014, reversal of tax reserves due to the expiration of statute of limitations from U.S. and foreign tax jurisdictions and reversal of tax reserves due to the resolution of tax audits. These benefits are included within the discrete tax benefits in the above table.

During fiscal 2014, we recorded net tax benefits of $1.4 million, related to the re-measurement and reversal of certain income tax reserves as a result of a federal income tax audit of fiscal 2012, the reassessment of state research and development tax credits and the release of income tax reserves due to the expiration of statute of limitations from U.S. and foreign tax jurisdictions. These benefits are included within the discrete tax benefits in the above table.

During fiscal 2013, we recorded net tax benefits of $0.8 million related to the January 2, 2013 enactment of the American Taxpayers Relief Act of 2012 extending the research and development tax credit for the last three quarters of fiscal 2012 and the release of income tax reserves due to the expiration of the statute of limitations from various U.S. and foreign tax jurisdictions. These benefits are included within the discrete tax benefits in the above table.

A reconciliation of the beginning and ending amount of unrecognized tax benefits is (in thousands):



	Fiscal years ended September 30,
	2015			2014			2013
Unrecognized tax benefits at beginning of fiscal year	$	2,301		$	3,332		$	2,720
Increases related to:
Prior year income tax positions	110			181			162
Current year income tax positions	144			148			733
Decreases related to:
Prior year income tax positions	(255		)	(1,105		)	—
Settlements	(74		)	(95		)	—
Expiration of statute of limitations	(608		)	(160		)	(283		)
Unrecognized tax benefits at end of fiscal year	$	1,618		$	2,301		$	3,332

The total amount of unrecognized tax benefits at September 30, 2015 that, if recognized, would affect our effective tax rate is $1.6 million. We expect that it is reasonably possible that the total amounts of unrecognized tax benefits will decrease approximately $0.2 million over the next 12 months due to the expiration of various statutes of limitations.

Of the $1.6 million of unrecognized tax benefits, $1.2 million is included in non-current income taxes payable and $0.4 million is included with non-current deferred tax assets on the consolidated balance sheet at September, 20, 2015.

We recognize interest and penalties related to income tax matters in income tax expense. During the fiscal years ended 2015 and 2014, there were $0.1 million and $0.2 million, respectively, of benefits for interest and penalties related to income tax matters in income tax expense. We had accrued interest and penalties related to unrecognized tax benefits of $0.3 million at September 30, 2015 and $0.4 million at September 30, 2014. Our long-term income taxes payable on our consolidated balance sheets includes these accrued interest and penalties in addition to the unrecognized tax benefits in the table above.

We operate in multiple tax jurisdictions both in the U.S. and outside of the U.S and face audits from various tax authorities regarding transfer pricing, tax credits, and other matters. Accordingly, we must determine the appropriate allocation of income to each of these jurisdictions. This determination requires us to make several estimates and assumptions. Tax audits associated with the allocation of this income, and other complex issues, may require an extended period of time to resolve and may result in adjustments to our income tax balances in those years that are material to our consolidated balance sheet and results of operations. With a few exceptions, we are no longer subject to income tax examination for tax years prior to fiscal 2013. For state taxing authorities, most notably in California and Texas, we are no longer subject to income tax examination for tax years generally before fiscal 2011, and for Minnesota for tax years prior to fiscal 2013. We do not anticipate significant changes to our unrecognized tax benefits as a result of these examinations.

At September 30, 2015, we had approximately $28.2 million of accumulated undistributed foreign earnings, for which we have not accrued additional U.S. tax. Our policy is to reinvest earnings of our foreign subsidiaries indefinitely to fund current

10. INCOME TAXES (CONTINUED)

operations and provide for future international expansion opportunities, and only repatriate earnings to the extent that U.S. taxes have already been recorded. Although we have no current need or intention to repatriate historical earnings in the form of cash in the United States, if we change our assertion from indefinitely reinvesting undistributed foreign earnings, we would have to accrue applicable taxes. The amount of any taxes and the application of any tax credits would be determined based on the income tax laws at the time of such repatriation. Under current tax laws, we estimate the unrecognized deferred tax liability to be up to $0.8 million.

- Definition

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

+ References+ Details

Stock-Based Compensation

12 Months Ended

Sep. 30, 2015

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

STOCK-BASED COMPENSATION

During fiscal 2015, stock-based awards were granted under the terms of the 2014 Omnibus Incentive Plan (the 2014 Plan). The authority to grant options under the 2014 Plan and set other terms and conditions rests with the Compensation Committee of the Board of Directors. We also have outstanding shares related to stock-based awards for plans in which we can no longer grant shares. These plans include the 2013 Omnibus Incentive Plan (the 2013 Plan), which expired during the second quarter of fiscal 2014, the 2000 Omnibus Stock Plan as amended and restated as of December 4, 2009 (the Omnibus Plan), which expired during the second quarter of fiscal 2013 and the Stock Option Plan as amended and restated as of November 27, 2006 (the Stock Option Plan) and Non-Officer Stock Option Plan as amended and restated as of November 27, 2006 (the Non-Officer Plan), both of which expired during the first quarter of fiscal 2007 (the Plans).

The 2014 Plan authorizes the issuance of up to 2,250,000 common shares in connection with awards of stock options, stock appreciation rights, restricted stock, restricted stock units, performance-based full value awards or other stock-based awards. Eligible participants include our employees, our affiliates, non-employee directors of our Company and any consultant or advisor who is a natural person and provides services to us or our affiliates. Options granted under this plan generally vest over a four year service period and will expire if unexercised after eight years from the date of grant. Restricted stock awards (RSU's) that were granted to Directors typically vest in one year. RSU's that were granted to executives and employees typically vest in November over a four-year period. Awards may be granted under the 2014 Plan until January 27, 2024 as the 2014 Plan was ratified on January 27, 2014 at the Annual Meeting of Stockholders. Options under the 2014 Plan can be granted as either incentive stock options (ISOs) or non-statutory stock options (NSOs). The exercise price of options and the grant date price of restricted stock shall be determined by our Compensation Committee but shall not be less than the fair market value of our common stock based on the closing price on the date of grant. As of September 30, 2015, there were approximately 1,369,684 shares available for future grants under the 2014 Plan.

The 2013 Plan authorized the issuance of up to 1,750,000 common shares in connection with awards of stock options, stock appreciation rights, restricted stock, restricted stock units, performance-based full value awards or stock awards. Eligible participants included our employees, non-employee directors, consultants and advisors. Options granted under this plan generally vested over a four year service period and will expire if unexercised after eight years from the date of grant. RSU's that were granted to Directors typically vested in one year. Awards may no longer be granted under the Incentive Plan as the plan was terminated effective January 27, 2014 at the Annual Meeting of Stockholders. Options under the 2013 Plan were granted as either ISOs or NSOs. The exercise price was determined by our Compensation Committee but could not be less than the fair market value of our common stock based on the closing price on the date of grant.

The Omnibus Plan authorized the issuance of up to 5,750,000 common shares in connection with awards of stock options, stock appreciation rights, restricted stock, performance units or stock awards. Eligible participants included our employees, non-employee directors, consultants and advisors. An authorization to issue an additional 2,500,000 common shares was ratified on January 25, 2010 at the Annual Meeting of Stockholders. Awards may no longer be granted under the Omnibus Plan as the plan was terminated as to future awards on January 28, 2013 at the Annual Meeting of Stockholders. Options under the Omnibus Plan were granted as either ISOs or non-statutory stock options NSOs. The exercise price was determined by our Compensation Committee but could not be less than the fair market value of our common stock based on the closing price on the date of grant.

Awards outstanding under the Stock Option Plan and the Non-Officer Plan included NSOs. In addition, the Stock Option Plan also included ISOs to employees and others who provided services to us, including consultants, advisers and directors. Options granted under these plans generally vested over a four year service period and will expire if unexercised after ten years from the date of grant. The exercise price for ISOs and non-employee director options granted under the Stock Option Plan was set at the fair market value of our common stock based on the closing price on the date of grant. The exercise price for NSOs granted under the Stock Option Plan or the Non-Officer Plan was set by the Compensation Committee of the Board of Directors and was set to the exercise price based on the closing price on the date of grant.

11. STOCK-BASED COMPENSATION (CONTINUED)

We recorded cash received from the exercise of stock options of $6.6 million, $3.7 million and $2.2 million during fiscal years 2015, 2014 and 2013, respectively. During fiscal 2015, there were no excess tax benefits from stock-based compensation. The excess tax benefits from stock-based compensation were minimal during fiscal 2014 and $0.1 million during fiscal year 2013. Upon exercise, we issue new shares of stock. Our award plans have provisions allowing employees to elect to pay their withholding obligation through share reduction (see Note 12).

We sponsor an Employee Stock Purchase Plan as amended and restated as of October 29, 2013, December 4, 2009 and November 27, 2006 (the Purchase Plan), covering all domestic employees with at least 90 days of continuous service and who are customarily employed at least 20 hours per week. The Purchase Plan allows eligible participants the right to purchase common stock on a quarterly basis at the lower of 85% of the market price at the beginning or end of each three-month offering period. The Purchase Plan was ratified on January 27, 2014 at the Annual Meeting of Stockholders to increase the number of shares reserved for future purchases by 800,000 shares bringing the total number of shares to 2,800,000 shares of our Common Stock that may be purchased under the plan. Employee contributions to the Purchase Plan were $0.9 million in fiscal 2015, and $1.0 million in both fiscal 2014 and 2013. Pursuant to the Purchase Plan, 123,847, 129,449, and 128,853 common shares were issued to employees during the fiscal years ended 2015, 2014 and 2013, respectively. Shares are issued under the Purchase Plan from treasury stock. As of September 30, 2015, 617,531 common shares were available for future issuances under the Purchase Plan.

Stock-based compensation cost capitalized as part of inventory was immaterial as of September 30, 2015, 2014 and 2013.

Stock-based compensation expense is included in the consolidated results of operations as follows (in thousands):



	Fiscal years ended September 30,
	2015			2014			2013
Cost of sales	$	356		$	345		$	183
Sales and marketing	1,197			1,179			1,261
Research and development	785			735			772
General and administrative	1,963			2,071			1,556
Stock-based compensation before income taxes	4,301			4,330			3,772
Income tax benefit	(1,493		)	(1,491		)	(1,192		)
Stock-based compensation after income taxes	$	2,808		$	2,839		$	2,580

The following table summarizes our stock option activity (in thousands, except per common share amounts):



	Options Outstanding		Weighted Average Exercised Price	Weighted Average Contractual Term (in years)	Aggregate Intrinsic Value (1)
Balance at September 30, 2014	6,029		$10.61
Granted	810		8.12
Exercised	(739	)	8.87
Forfeited / Canceled	(1,300	)	11.55
Balance at September 30, 2015	4,800		$10.21	4.8	$	9,163

Exercisable at September 30, 2015	3,540		$10.66	4.1	$	5,575

(1) The aggregate intrinsic value represents the total pre-tax intrinsic value, based on our closing stock price of $11.79 as of September 30, 2015, which would have been received by the option holders had all option holders exercised their options as of that date.

The intrinsic value of an option is the amount by which the fair value of the underlying stock exceeds its exercise price. The total intrinsic value of all options exercised during each of the twelve months ended September 30, 2015, 2014 and 2013 was $0.9 million, $0.5 million and $0.5 million, respectively.

11. STOCK-BASED COMPENSATION (CONTINUED)

The table below shows the weighted average fair value, which was determined based upon the fair value of each option on the grant date utilizing the Black-Scholes option-pricing model and the related assumptions:



	Fiscal years ended September 30,
	2015		2014		2013
Weighted average per option grant date fair value	$	2.98	$	4.35	$	3.77
Assumptions used for option grants:
Risk free interest rate	1.57% - 1.85%		1.76% - 2.02%		0.88% - 1.78%
Expected term	6.00 years		6.00 years		6.25 years
Expected volatility	32% - 36%		38% - 40%		40%
Weighted average volatility	35%		40%		40%
Expected dividend yield	0		0		0

The fair value of each option award granted during the periods presented was estimated using the Black-Scholes option valuation model that uses the assumptions noted in the table above. Expected volatilities are based on the historical volatility of our stock. We use historical data to estimate option exercise and employee termination information within the valuation model; separate groups of grantees that have similar historical exercise behaviors are considered separately for valuation purposes. The expected term of options granted is derived from the vesting period and historical information and represents the period of time that options granted are expected to be outstanding. The risk-free rate used is the zero-coupon U.S. Treasury bond rate in effect at the time of the grant whose maturity equals the expected term of the option.

We use historical data to estimate pre-vesting forfeiture rates. The pre-vesting forfeiture rate used in fiscal 2015 was 6.0%. As of September 30, 2015 the total unrecognized compensation cost related to non-vested stock-based compensation arrangements, net of expected forfeitures, was $3.6 million and the related weighted average period over which it is expected to be recognized is approximately 2.7 years.

At September 30, 2015, the weighted average exercise price and remaining life of the stock options are as follows (in thousands, except remaining life and exercise price):



Options Outstanding					Options Exercisable
Range of Exercise Prices	Options Outstanding	Weighted Average Remaining Contractual Life (In Years)	Weighted Average Exercise Price		Number of Shares Vested	Weighted Average Exercise Price
$7.40 - $8.03	777	5.32	$	7.74	439	$	8.01
$8.04 - $9.35	1,006	6.10	$	8.79	521	$	8.98
$9.36 - $9.95	751	4.94	$	9.69	709	$	9.69
$9.96 - $10.81	1,119	6.05	$	10.66	724	$	10.68
$10.82 - $13.41	883	2.00	$	12.41	883	$	12.41
$13.42 - $14.75	27	3.22	$	14.35	27	$	14.35
$14.76 - $15.23	237	2.05	$	15.23	237	$	15.23
$7.40 - $15.23	4,800	4.81	$	10.21	3,540	$	10.66

The total grant date fair value of shares vested was $2.9 million in fiscal 2015, $0.8 million in fiscal 2014 and $3.1 million in fiscal 2013.

11. STOCK-BASED COMPENSATION (CONTINUED)

A summary of our non-vested restricted stock units as of September 30, 2015 and changes during the twelve months then ended is presented below (in thousands, except per common share amounts):



	Number of Awards		Weighted Average Grant Date Fair Value
Nonvested at September 30, 2014	171		$	9.35
Granted	503		$	8.27
Vested	(91	)	$	9.66
Canceled	(40	)	$	7.77
Nonvested at September 30, 2015	543		$	8.41

As of September 30, 2015, the total unrecognized compensation cost related to non-vested restricted stock units was $3.2 million and the related weighted average period over which it is expected to be recognized is approximately 1.4 years.

- Definition

The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details.

+ References+ Details

Common Stock Repurchase	12 Months Ended
Common Stock Repurchase	Sep. 30, 2015
Common Stock Repurchase [Abstract]
COMMON STOCK REPURCHASE	COMMON STOCK REPURCHASE Common Stock Repurchase Program On October 29, 2013, our Board of Directors authorized a program to repurchase up to $20.0 million of our common stock, primarily to support our employee stock purchase program and to return capital to shareholders. Shares repurchased under this program were permitted either through the open market or privately negotiated transactions from time to time and in amounts that management deemed appropriate. During the first quarter of fiscal 2015, we repurchased 287,787 shares for $2.2 million under this plan which expired on October 31, 2014. On October 28, 2014, our Board of Directors authorized a program to repurchase up to $15 million of our common stock, primarily to return capital to shareholders and to support our employee stock purchase program. This authorization began on November 1, 2014 and expired on October 31, 2015. There were no shares repurchased under this program. Restricted Stock Unit Withholdings We issue restricted stock units as part of our equity incentive plans. When the restricted stock units vest and become taxable to our employees, they may elect to have us deduct shares on their behalf to pay the appropriate taxing authorities. In our consolidated financial statements, we treat these shares withheld for tax purposes on behalf of our employees as common stock repurchases. These withheld shares are not considered common stock repurchases on our authorized common stock repurchase program. During fiscal 2015, we used $0.1 million to repurchase shares to satisfy these withholding obligations. There were no purchases of shares to satisfy withholding obligations during fiscal 2014 and 2013.

Share Rights Plan	12 Months Ended
Share Rights Plan	Sep. 30, 2015
Warrants and Rights Note Disclosure [Abstract]
SHARE RIGHTS PLAN	SHARE RIGHTS PLAN Under our share rights plan, each right entitles its holder to buy one one-hundredth of a share of a Series A Junior Participating Preferred Stock at an exercise price of $60, subject to adjustment. The rights are not exercisable until a specified distribution date as defined in the Share Rights Agreement. The Rights will expire on June 30, 2018, unless extended or earlier redeemed or exchanged by us as defined in the Share Rights Agreement.

- Definition

Tabular disclosure of warrants or rights issued. Warrants and rights outstanding are derivative securities that give the holder the right to purchase securities (usually equity) from the issuer at a specific price within a certain time frame. Warrants are often included in a new debt issue to entice investors by a higher return potential. The main difference between warrants and call options is that warrants are issued and guaranteed by the company, whereas options are exchange instruments and are not issued by the company. Also, the lifetime of a warrant is often measured in years, while the lifetime of a typical option is measured in months. Disclose the title of issue of securities called for by warrants and rights outstanding, the aggregate amount of securities called for by warrants and rights outstanding, the date from which the warrants or rights are exercisable, and the price at which the warrant or right is exercisable.

+ References+ Details

Employee Benefit Plans	12 Months Ended
Employee Benefit Plans	Sep. 30, 2015
Compensation and Retirement Disclosure [Abstract]
EMPLOYEE BENEFIT PLANS	EMPLOYEE BENEFIT PLANS We currently have a savings and profit sharing plan pursuant to Section 401(k) of the Internal Revenue Code (the Code), whereby eligible employees may contribute up to 25% of their pre-tax earnings, not to exceed amounts allowed under the Code. We provide a match of 100% on the first 3% of each employee’s bi-weekly contribution and a 50% match on the next 2% of each employee’s bi-weekly contribution. In addition, we may make contributions to the plan at the discretion of the Board of Directors. We provided matching contributions of $1.7 million for fiscal 2015, $1.6 million for fiscal 2014 and $1.4 million for fiscal 2013.

- Definition

The entire disclosure for pension and other postretirement benefits.

+ References+ Details

Commitments

12 Months Ended

Sep. 30, 2015

Leases, Operating [Abstract]

COMMITMENTS

We have entered into various operating lease agreements for office facilities and equipment, the last of which expires in fiscal 2020. The office facility leases generally require us to pay a pro-rata share of the lessor’s operating expenses. Certain operating leases contain escalation clauses and are being amortized on a straight-line basis over the term of the lease.

The following schedule reflects future minimum rental commitments under noncancelable operating leases (in thousands):



Fiscal year	Amount
2016	$	1,993
2017	1,127
2018	648
2019	444
2020	40
Thereafter	—
Total minimum payments required	$	4,252

The following schedule shows the composition of total rental expense for all operating leases for the years ended September 30 (in thousands):



	Fiscal years ended September 30,
	2015			2014			2013
Rentals	$	2,591		$	2,967		$	3,053
Less: sublease rentals	(56		)	(24		)	(31		)
Total rental expense	$	2,535		$	2,943		$	3,022

- Definition

The entire disclosure for lessee entity's leasing arrangements including, but not limited to, all of the following: (a.) The basis on which contingent rental payments are determined, (b.) The existence and terms of renewal or purchase options and escalation clauses, (c.) Restrictions imposed by lease agreements, such as those concerning dividends, additional debt, and further leasing.

+ References+ Details

Contingencies	12 Months Ended
Contingencies	Sep. 30, 2015
Commitments and Contingencies Disclosure [Abstract]
CONTINGENCIES	CONTINGENCIES Patent Infringement Lawsuits On May 29, 2012, U.S. Ethernet Innovations, LLC filed a patent infringement lawsuit against us in federal court in the Eastern District of Texas. The lawsuit included allegations against us and one other company pertaining to the infringement of four patents related to Ethernet technology. On April 22, 2013, we announced the settlement of this patent infringement lawsuit for $1.5 million, which was recorded in general and administrative expense on our Consolidated Statements of Operations during the second quarter of fiscal 2013. The settlement was paid during the third quarter of fiscal 2013. The settlement fully resolved the claims by USEI with no future payment obligations. Net of taxes, the settlement was $1.0 million and therefore reduced earnings per diluted share for the second quarter of fiscal 2013 by approximately $0.04. In addition to the matters discussed above, in the normal course of business, we are subject to various claims and litigation, which may include, but are not limited to, patent infringement and intellectual property claims. While we are unable to predict the outcome of any potential claims or litigation due to the inherent unpredictability of these matters, we believe that it is possible that we could, in the future, incur judgments or enter into settlements of claims that could have a material adverse effect on our operations in any particular period.

- Definition

The entire disclosure for commitments and contingencies.

+ References+ Details

Quarterly Financial Data

12 Months Ended

Sep. 30, 2015

Quarterly Financial Information Disclosure [Abstract]

Quarterly Financial Data

QUARTERLY FINANCIAL DATA (UNAUDITED)

(in thousands, except per common share data)



	Quarter ended
	Dec. 31			March 31		June 30			Sept. 30
Fiscal 2015
Revenue	$	48,723		$	53,151	$	54,538		$	56,446
Gross profit	21,922			24,078		25,349			26,682
Net (loss) income (1)(2)(3)	(339		)	1,446		2,496			2,985
Net (loss) income per common share - basic	(0.01		)	0.06		0.10			0.12
Net (loss) income per common share - diluted	(0.01		)	0.06		0.10			0.12

Fiscal 2014
Revenue	$	47,322		$	45,882	$	47,885		$	51,612
Gross profit	22,908			21,780		22,149			23,647
Net income (loss) (1)	688			738		(101		)	426
Net income per common share - basic	0.03			0.03		—			0.02
Net income per common share - diluted	0.03			0.03		—			0.02

(1)

During fiscal 2015 and 2014, we recorded net tax benefits of $0.9 million and $1.4 million, respectively. We recorded a benefit of $0.5 million in the first quarter of fiscal 2015 resulting from the reinstatement of the research and development tax credit for calendar year 2014, reversal of income tax reserves due to the expiration of the statute of limitations from various U.S. and foreign tax jurisdictions and reversal of tax reserves due to the resolution of tax audits. In the third quarter of fiscal 2015, we recorded a tax benefit of $0.4 million primarily due to the reversal of reserves for state research and development tax credits and transfer pricing, partially offset by an adjustment of the state rate on net deferred tax assets. We recorded net tax benefits of $0.2 million in the first quarter of fiscal 2014 resulting from the release of income tax reserves due to the expiration of the statute of limitations from various U.S. and foreign tax jurisdictions. During the second quarter of fiscal 2014, we recorded a tax benefit of $1.1 million resulting from re-measurement and reversal of certain income tax reserves as a result of the conclusion of a federal income tax audit for fiscal 2012. In the third quarter of fiscal 2014, we recorded a tax benefit of $0.1 million primarily for a valuation allowance reversal associated with the reassessment of state research and development tax credits.


(2)	In the second quarter of fiscal 2015, we recorded a business restructuring accrual of $0.5 million ($0.3 million after tax).

(3)

During fiscal 2015, we recorded a gain of $1.4 million from the settlement of a property and casualty insurance claim related to the replacement of our capital equipment destroyed in the fire at our subcontract manufacturer's location. We recorded $1.0 million ($0.6 million after tax) during the second quarter of fiscal 2015 and $0.4 million ($0.3 million after tax) during the third quarter of fiscal 2015.

- Definition

The entire disclosure for the quarterly financial data in the annual financial statements. The disclosure may include a tabular presentation of financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income or loss before extraordinary items and earnings per share data. It also includes an indication if the information in the note is unaudited, comments on the aggregate effect of year-end adjustments, and an explanation of matters or transactions that affect comparability or are pertinent to an understanding of the information furnished.

+ References+ Details

Subsequent Event

12 Months Ended

Sep. 30, 2015

Subsequent Events [Abstract]

SUBSEQUENT EVENTS

Acquisition of Bluenica Corporation

On October 5, 2015 we purchased all of the outstanding stock of Bluenica Corporation, a company focused on temperature monitoring of perishable goods in the food industry by using wireless sensors which are installed in grocery and convenience stores, restaurants, and in products during shipment and storage to ensure that quality, freshness and public health requirements are met. We believe that this is a complementary acquisition for us and will provide a source of recurring subscription revenue from cloud services in addition to product revenue from sensors and gateways.

The terms of the acquisition include an upfront cash payment together with earn-out payments. Cash of $2.9 million was paid at time of closing. The earn-out payments are scheduled to be paid in installments over a four-year period based on revenue achievement of the acquired business. The cumulative amount of these earn-out payments will not exceed $11.6 million. An additional payment, not to exceed $3.5 million, may also be due depending on revenue performance. We have determined that the earn-out will be considered as part of the purchase price consideration as there are no continuing employment requirements associated with the earn-out. A preliminary purchase price allocation and estimated acquisition costs are not available due to the timing of the acquisition.

Disposition of Etherios, Inc.

On October 23, 2015, we sold all the outstanding stock of our wholly owned subsidiary, Etherios, Inc. to West Monroe Partners, LLC. We sold our CRM business as part of a strategy to improve our focus on providing highly reliable machine connectivity solutions for business-critical and mission-critical application environments. Beginning in fiscal 2016, we will report Etherios as discontinued operations within our single operating segment.

We sold the Etherios business for $9.0 million, subject to certain purchase price adjustments. Of the total purchase price, $4.0 million, less employee related liabilities of approximately $1.1 million, was paid at closing. Below is a summary of the proceeds (in thousands):



Cash due at closing	$	4,000
Less: Employee related liabilities	(1,134		)
Net cash proceeds at closing	2,866
Deferred payment due October 23, 2016	3,000
Deferred payment due October 23, 2017	2,000
Total proceeds	$	7,866

Restructuring

On November 19, 2015, we approved a restructuring plan impacting our corporate staff. The plan most principally will close our Dortmund office and relocate certain employees to our Munich office. We expect to incur charges in the range of $0.4 million to $0.6 million in connection with these restructuring activities. The charges relate to severance payments to impacted employees. We expect to complete all payments associated with the charges by the end of fiscal 2016.

Schedule II - Valuation and Qualifying Accounts

12 Months Ended

Sep. 30, 2015

Valuation and Qualifying Accounts [Abstract]

Schedule II- Valuation and Qualifying Accounts

SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS

DIGI INTERNATIONAL INC.

(in thousands)



Description	Balance at beginning of period		Increase (Decrease) to costs and expenses		Deductions			Balance at end of period
Valuation allowance - deferred tax assets
September 30, 2015	$	572	$	316	$	26		$	862
September 30, 2014	$	807	$	174	$	409		$	572
September 30, 2013	$	887	$	170	$	250		$	807

Valuation account - doubtful accounts
September 30, 2015	$	367	$	202	$	86	(1)	$	483
September 30, 2014	$	313	$	209	$	155	(1)	$	367
September 30, 2013	$	295	$	309	$	291	(1)	$	313

Reserve for future returns and pricing adjustments
September 30, 2015	$	1,662	$	7,002	$	6,847		$	1,817
September 30, 2014	$	1,770	$	6,526	$	6,634		$	1,662
September 30, 2013	$	1,362	$	6,973	$	6,565		$	1,770


(1)	Uncollectible accounts charged against allowance, net of recoveries

Summary of Significant Accounting Policies (Policies)	12 Months Ended
Summary of Significant Accounting Policies (Policies)	Sep. 30, 2015
Accounting Policies [Abstract]
Principles of Consolidation	Principles of Consolidation The consolidated financial statements include our accounts and the accounts of our wholly-owned subsidiaries. All intercompany accounts and transactions have been eliminated in consolidation.
Cash Equivalents	Cash Equivalents Cash equivalents consist of money market accounts and other highly liquid investments purchased with an original maturity of three months or less. The carrying amounts approximate fair value due to the short maturities of these investments.
Marketable Securities	Marketable Securities Marketable securities consist of certificates of deposit, commercial paper, corporate bonds and government municipal bonds. All marketable securities are accounted for as available-for-sale and are carried at fair value on our consolidated balance sheets with unrealized gains and losses recorded in accumulated other comprehensive loss within stockholders’ equity. In order to estimate the fair value for each security in our investment portfolio, we obtain quoted market prices and trading activity for each security where available. We obtain relevant information from our investment advisor and, if warranted, also may review the financial solvency of certain security issuers. We regularly monitor and evaluate the value of our marketable securities. When assessing marketable securities for other-than-temporary declines in value, we consider several factors. These factors include: how significant the decline in value is as a percentage of the original cost, how long the market value of the investment has been less than its original cost, the underlying factors contributing to a decline in the prices of securities in a single asset class, the performance of the issuer’s stock price in relation to the stock price of its competitors within the industry, expected market volatility, analyst recommendations, the views of external investment managers, any news or financial information that has been released specific to the investee and the outlook for the overall industry in which the issuer operates. If events and circumstances indicate that a decline in the value of a security has occurred and is other-than-temporary, we would record a charge to other income (expense).
Accounts Receivable	Accounts Receivable Accounts receivable are stated at the amount we expect to collect, which is net of an allowance for doubtful accounts for estimated losses resulting from the inability of our customers to make required payments. The following factors are considered when determining the collectability of specific customer accounts: customer creditworthiness, past transaction history with the customer, and changes in customer payment terms or practices. In addition, overall historical collection experience, current economic industry trends, and a review of the current status of trade accounts receivable are considered when determining the required allowance for doubtful accounts. Based on our assessment, we provide for estimated uncollectible amounts through a charge to earnings and a credit to our allowance for doubtful accounts. Balances that remain outstanding after we have used reasonable collection efforts are written off through a charge to the allowance for doubtful accounts and a credit to accounts receivable.
Inventories	Inventories Inventories are stated at the lower of cost or fair market value, with cost determined using the first-in, first-out method. Appropriate consideration is given to deterioration, obsolescence and other factors in evaluating fair market value.
Property, Equipment and Improvements, Net	Property, Equipment and Improvements, Net Property, equipment and improvements are carried at cost, net of accumulated depreciation. Depreciation is provided by charges to operations using the straight-line method over the estimated asset useful lives. Furniture and fixtures and other equipment are depreciated over a period of three to five years. Building improvements and buildings are depreciated over ten and thirty-nine years, respectively. Expenditures for maintenance and repairs are charged to operations as incurred, while major renewals and betterments are capitalized. The assets and related accumulated depreciation accounts are adjusted for asset retirements and disposals with the resulting gain or loss included in operations.
Identifiable Intangible Assets	Identifiable Intangible Assets Purchased proven technology, license agreements, covenants not to compete and other identifiable intangible assets are recorded at fair value when acquired in a business acquisition, or at cost when not purchased in a business acquisition. Purchased in-process research and development costs (IPR&D) related to business combinations are capitalized and amortized once placed in service. All other identifiable intangible assets are amortized on either a straight-line basis over their estimated useful lives of three to thirteen years or based on the pattern in which the asset is consumed. Useful lives for identifiable intangible assets are estimated at the time of acquisition based on the periods of time from which we expect to derive benefits from the identifiable intangible assets. Amortization of purchased and core technology is included in cost of product in the Consolidated Statements of Operations. Amortization of all other acquired identifiable intangible assets is charged to operating expenses as a component of general and administrative expense. Identifiable intangible assets are reviewed for impairment annually or whenever events or circumstances indicate that undiscounted expected future cash flows are not sufficient to recover the carrying value amount. We measure impairment loss by utilizing an undiscounted cash flow valuation technique using fair values indicated by the income approach. Impairment losses, if any, would be recorded in the period the impairment is identified.
Goodwill	Goodwill Goodwill represents the excess of cost over the fair value of identifiable assets acquired. Goodwill is tested for impairment on an annual basis as of June 30, or more frequently if events or circumstances occur which could indicate impairment. The calculation of goodwill impairment requires us to make assumptions about the fair value of our one reporting unit, which historically has been approximated by using our market capitalization plus a control premium. Control premium assumptions require judgment and actual results may differ from assumed or estimated amounts.
Warranties	Warranties In general, we warrant our hardware products to be free from defects in material and workmanship under normal use and service. The warranty periods generally range from one to five years. We typically have the option to either repair or replace hardware products we deem defective with regard to material or workmanship. Estimated warranty costs are accrued in the period that the related revenue is recognized based upon an estimated average per unit repair or replacement cost applied to the estimated number of units under warranty. These estimates are based upon historical warranty incidents and are evaluated on an ongoing basis to ensure the adequacy of the warranty accrual.
Revenue Recognition	Revenue Recognition We recognize revenue in accordance with authoritative guidance issued by FASB related to revenue recognition. Hardware product revenue as a percentage of total revenue was 91.8%, 89.7% and 88.6% in fiscal 2015, 2014 and 2013, respectively. We recognize hardware product revenue when persuasive evidence of an arrangement exists, delivery has occurred, the sales price is fixed or determinable, collectability is reasonably assured and there are no post-delivery obligations, other than warranty. Under these criteria, product revenue generally is recognized upon shipment of product to customers. Sales to authorized domestic and foreign distributors and Direct / OEMs are made with certain rights of return and price adjustment provisions. Estimated reserves for future returns and pricing adjustments are established by us based on an analysis of historical patterns of returns and price adjustments as well as an analysis of authorized returns compared to received returns and distribution sales for the current period. Estimated reserves for future returns and price adjustments are charged against revenue in the same period as the corresponding revenue is recorded. Service revenue as a percentage of total revenue represented 8.2%, 10.3% and 11.4% in fiscal 2015, 2014 and 2013, respectively. Our service revenue is derived primarily from professional and engineering services performed by our Etherios customer relationship management (CRM) services and our wireless design services. We also have some service revenue that is derived from our Digi Device Cloud, which is a platform-as-a-service (PaaS) offering in which customers pay for services consumed in terms of devices being managed and monitored, or as a monthly service fee for access to information. In addition, we have small amounts of revenue from our enterprise support services. We recognize service revenue from our Etherios CRM services, wireless design services, and Device Cloud based upon performance, including final product delivery and customer acceptance. In addition, we recognize small amounts of revenue from and enterprise support services which is recognized over the life of the contract, and training as the services are performed.
Research and Development	Research and Development Research and development costs are expensed when incurred. Research and development costs include compensation, allocation of corporate costs, depreciation, utilities, professional services and prototypes. Software development costs are expensed as incurred until the point that technological feasibility and proven marketability of the product are established. To date, the time period between the establishment of technological feasibility and completion of software development has been short, and no significant development costs have been incurred during that period. Accordingly, we have not capitalized any software development costs to date.
Income Taxes	Income Taxes Deferred income taxes are recognized for the tax consequences in future years of differences between the tax basis of assets and liabilities and their financial reporting amounts at each year end based on enacted tax laws and statutory tax rates applicable to the periods in which the differences are expected to affect taxable income. Income tax expense is equal to the tax payable for the period and the change during the period in deferred tax assets and liabilities and also changes in income tax reserves.
Stock-Based Compensation	Stock-Based Compensation Stock-based compensation expense represents the cost of employee services received in exchange for an award of equity instruments based on the grant date fair value of the award. This cost must be recognized over the period during which an employee is required to provide the service (usually the vesting period).
Foreign Currency Translation	Foreign Currency Translation Financial position and results of operations of our international subsidiaries are measured using local currencies as the functional currency, except for our Singapore location which uses the U.S. Dollar as its local currency. Assets and liabilities of these operations are translated at the exchange rates in effect at the end of each reporting period. For our larger international subsidiaries, statements of operations accounts are translated at the daily rate. For all other international subsidiaries, our statements of operations accounts are translated at the weighted average rates of exchange prevailing during each reporting period. Translation adjustments arising from the use of differing currency exchange rates from period to period are included in accumulated other comprehensive loss in stockholders’ equity. Gains and losses on foreign currency exchange transactions, as well as translation gains or losses on transactions denominated in currencies other than an entity’s functional currency, are reflected in the statement of operations. During fiscal 2015, 2014 and 2013, there were net transaction gains of $0.6 million, 1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED) $0.5 million and $0.4 million, respectively, that were recorded in other income (expense). We manage our net asset or net liability position for U.S. dollar accounts in our foreign locations to reduce our foreign currency risk. We have not implemented a formal hedging strategy.
Net Income Per Common Share	Net Income Per Common Share Basic net income per common share is calculated based on the weighted average number of common shares outstanding during the period. Diluted net income per common share is computed by dividing net income by the weighted average number of common and potentially dilutive common shares outstanding during the period. Potentially dilutive common shares of our stock result from dilutive common stock options and restricted stock units. We use the treasury stock method to calculate the weighted-average shares used in the diluted earnings per share computation. Under the treasury stock method, the proceeds from exercise of an option, the amount of compensation cost, if any, for future service that we have not yet recognized, and the amount of estimated tax benefits that would be recorded in paid-in capital, if any, when the option is exercised are assumed to be used to repurchase shares in the current period.
Use of Estimates and Risks and Uncertainties	Use of Estimates and Risks and Uncertainties The preparation of consolidated financial statements in conformity with generally accepted accounting principles in the United States requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amount of revenue and expenses during the reporting period. Actual results could differ from those estimates. Estimates that could significantly affect our results of operations or financial condition involve the assignment of fair values upon acquisition of goodwill and other intangible assets and testing for impairment; the determination of our allowance for doubtful accounts and reserve for future returns and pricing adjustments; the estimation of our inventory obsolescence, warranty reserve, income tax reserves and other contingencies.
Comprehensive Income (Loss)	Comprehensive Income (Loss) Our comprehensive income (loss) is comprised of net income, foreign currency translation adjustments and unrealized gains and losses on available-for-sale marketable securities, which are charged or credited to the accumulated other comprehensive loss account in stockholders’ equity.
Recent Accounting Developments	Recent Accounting Developments Adopted In July 2013, the Financial Accounting Standards Board (“FASB”) issued ASU 2013-11, “Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists.” This guidance relates to the presentation of an unrecognized tax benefit when a net operating loss carryforward, a similar tax loss, or a tax credit carryforward exists. The standard update provides that a liability related to an unrecognized tax benefit should be offset against same jurisdiction deferred tax assets for a net operating loss carryforward, a similar tax loss, or a tax credit carryforward if such settlement is required or expected in the event the uncertain tax position is disallowed. This guidance was effective prospectively for fiscal years (and interim reporting periods within those years) beginning after December 15, 2013. We adopted this guidance during the fiscal quarter ended December 31, 2014, resulting in a reclassification of $0.4 million of unrecognized tax benefits to noncurrent deferred tax assets. In March 2013, FASB issued ASU 2013-05, “Foreign Currency Matters (Topic 830): Parent’s Accounting for the Cumulative Translation Adjustment upon Derecognition of Certain Subsidiaries or Groups of Assets within a Foreign Entity or of an Investment in a Foreign Entity.” This guidance applies to the release of the cumulative translation adjustment into net income when a parent either sells a part or all of its investment in a foreign entity or no longer holds a controlling financial interest in a subsidiary or group of assets that is a business within a foreign entity. ASU 2013-05 was effective prospectively for fiscal years (and interim reporting periods within those years) beginning after December 15, 2013. We adopted this guidance during the fiscal quarter ended December 31, 2014. There was no impact on our condensed consolidated financial statements as we have not sold any foreign entities for which we hold a controlling financial interest. Not Yet Adopted In September 2015, FASB issued ASU 2015-16, "Simplifying the Accounting for Measurement-Period Adjustments." To simplify the accounting for adjustments made to provisional amounts recognized in a business combination, the amendments in this update eliminate the requirement to retrospectively account for those adjustments. The amendments in this update are effective for fiscal years beginning after December 15, 2015, including interim periods within those years, which for us will be the first fiscal quarter ending December 31, 2016. Earlier application is permitted for financial statements that have not been issued. We are currently evaluating the impact of the adoption of ASU 2015-16. In July 2015, FASB issued ASU 2015-11, "Simplifying the Measurement of Inventory." This provision would require inventory that was previously recorded using first-in, first-out (FIFO) to lower of cost and net realizable value. Net realizable value is the estimated selling price in the ordinary course of business, less reasonably predictable costs of completion, disposal, and transportation. This guidance is effective for fiscal years beginning after December 15, 2016 and interim periods within those years, which for us will be the first fiscal quarter ending December 31, 2017. The amendments in this guidance should be applied prospectively with earlier application permitted as of the beginning of an interim or annual period. We are currently evaluating the impact of the adoption of ASU 2015-11 and whether it would have a material impact on our consolidated financial statements. In April 2015, FASB issued ASU 2015-05, “Intangibles-Goodwill and Other-Internal-Use Software (Subtopic 350-40) - Customer’s Accounting for Fees Paid in a Cloud Computing Arrangement. The new standard provides guidance to customers about whether a cloud computing arrangement includes a software license. If the arrangement does include a software license, the software license element of the arrangement should be accounted for in the same manner as the acquisition of other software licenses. This guidance is effective for fiscal years, and interim periods within those years, beginning after December 15, 2015, with early adoption permitted. We expect to adopt this guidance beginning with our fiscal quarter ending December 31, 2016. We do not expect this guidance to have a material impact on our consolidated financial statements. In August 2014, FASB issued ASU 2014-15, “Presentation of Financial Statements - Going Concern.” This guidance requires management to evaluate whether there is substantial doubt about a company’s ability to continue as a going concern and to provide related footnote disclosures. These amendments are effective for the annual period ending after December 15, 2016, and for annual periods and interim periods thereafter, which for us, will be the fourth fiscal quarter ended September 30, 2017. Early adoption is permitted. While we are evaluating the impact of the adoption of ASU 2014-15, we do not expect it to have an impact on our consolidated financial statements. 1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED) In May 2014, FASB issued ASU 2014-09, “Revenue from Contracts with Customers.” This guidance provides a five-step analysis in determining when and how revenue is recognized so that an entity will recognize revenue when it transfers promised goods or services to customers in an amount that reflects what it expects in exchange for the goods and services. It also requires more detailed disclosures to enable users of financial statements to understand the nature, amount, timing and uncertainty of revenue and cash flows arising from contracts with customers. In August 2015, the FASB issued ASU 2015-14 "Revenue from Contracts with Customers (Topic 606): Deferral of the Effective Date" which approved a one-year deferral of the effective date of ASU 2014-09. As a result of this deferral, ASU 2014-09 is effective for our fiscal 2019, including interim periods within that reporting period. The FASB also agreed to allow us to choose to adopt the standard effective for our fiscal 2018. We are assessing the adoption date and potential impact of adopting this ASU on our consolidated financial statements and related disclosures.

Summary of Significant Accounting Policies (Tables)

12 Months Ended

Sep. 30, 2015

Accounting Policies [Abstract]

Schedule of Calculation of Numerator and Denominator in Earnings Per Share

The following table is a reconciliation of the numerators and denominators in the net income per common share calculations (in thousands, except per common share data):



	Fiscal years ended September 30,
	2015		2014		2013
Numerator:
Net income	$	6,588	$	1,751	$	5,805
Denominator:
Denominator for basic net income per common share — weighted average shares outstanding	24,645		25,345		25,956
Effect of dilutive securities:
Stock options and restricted stock units	582		385		281
Denominator for diluted net income per common share — adjusted weighted average shares	25,227		25,730		26,237
Net income per common share, basic	$	0.27	$	0.07	$	0.22
Net income per common share, diluted	$	0.26	$	0.07	$	0.22

Goodwill and other Identifiable Intangible Assets (Tables)

12 Months Ended

Sep. 30, 2015

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Amortizable Identifiable Intangible Assets

Amortizable identifiable intangible assets, net as of September 30, 2015 and 2014 are comprised of the following (in thousands):



	September 30, 2015							September 30, 2014
	Gross carrying amount		Accum. amort.			Net		Gross carrying amount		Accum. amort.			Net
Purchased and core technology	$	45,449	$	(45,424	)	$	25	$	45,952	$	(45,162	)	$	790
License agreements	18		(4		)	14		2,440		(2,440		)	—
Patents and trademarks	11,817		(10,568		)	1,249		11,667		(9,799		)	1,868
Customer relationships	18,490		(16,057		)	2,433		18,894		(15,445		)	3,449
Non-compete agreements	1,100		(642		)	458		1,100		(422		)	678
Order backlog	—		—			—		360		(360		)	—
Total	$	76,874	$	(72,695	)	$	4,179	$	80,413	$	(73,628	)	$	6,785

Schedule of Amortization Expense

Amortization expense for fiscal years 2015, 2014 and 2013 is as follows (in thousands):



Fiscal year	Total
2015	$	2,910
2014	$	3,589
2013	$	4,416

Schedule of Estimated Future Amortization Expense Related to Identifiable Intangible Assets

Estimated amortization expense for the next five years is as follows (in thousands):



Fiscal year	Total
2016	$	1,944
2017	$	1,061
2018	$	487
2019	$	451
2020	$	168

Schedule of Changes in Carrying Amount of Goodwill

The changes in the carrying amount of goodwill were (in thousands):



	Fiscal years ended September 30,
	2015			2014
Beginning balance, October 1	$	103,398		$	103,569
Foreign currency translation adjustment	(1,301		)	(171		)
Ending balance, September 30	$	102,097		$	103,398

Segment Information and Major Customers (Tables)

12 Months Ended

Sep. 30, 2015

Segment Reporting [Abstract]

Schedule of Revenue by Product Categories

The following table presents our revenue by our new product categories (in thousands):



	Fiscal years ended September 30,
	2015		2014		2013
Cellular routers and gateways	$	58,666	$	39,215	$	33,227
RF	34,373		29,094		29,157
Embedded	51,063		49,681		57,597
Network	51,395		54,856		53,097
Total product revenue	195,497		172,846		173,078
Service	17,361		19,855		22,303
Total revenue	$	212,858	$	192,701	$	195,381

Schedule of Revenue by Growth and Mature Categories

The following table presents revenue for our growth and mature categories (in thousands):



	Fiscal years ended September 30,
	2014		2013		2012
Growth hardware products and all services	$	133,572	$	109,763	$	110,350
Mature hardware products	79,286		82,938		85,031
Total revenue	$	212,858	$	192,701	$	195,381

Schedule of Revenue by Geographic Location

The information in the following table provides revenue by the geographic location of the customer for the fiscal years ended September 30, 2015, 2014 and 2013 (in thousands):



	Fiscal years ended September 30,
	2015		2014		2013
North America, primarily United States	$	136,603	$	116,421	$	116,541
Europe, Middle East & Africa	47,523		47,729		48,815
Asia	22,907		22,762		24,507
Latin America	5,825		5,789		5,518
Total revenue	$	212,858	$	192,701	$	195,381

Schedule of Net Property, Equipment and Improvements by Geographical Location

Net property, equipment and improvements by geographic location are as follows (in thousands):



	Fiscal years ended September 30,
	2015		2014		2013
United States	$	14,103	$	12,813	$	13,321
International, primarily Europe	254		418		589
Total net property, equipment and improvements	$	14,357	$	13,231	$	13,910

Marketable Securities (Tables)

12 Months Ended

Sep. 30, 2015

Marketable Securities [Abstract]

Schedule of Marketable Securities

At September 30, 2015 our marketable securities were (in thousands):



	Amortized Cost (1)		Unrealized Gains		Unrealized Losses			Fair Value (1)
Current marketable securities:
Corporate bonds	$	31,753	$	—	$	(39	)	$	31,714
Commercial paper	7,986		—		(1		)	7,985
Certificates of deposit	6,253		8		—			6,261
Government municipal bonds	1,232		—		—			1,232
Current marketable securities	47,224		8		(40		)	47,192
Non-current marketable securities:
Corporate bonds	4,138		—		(13		)	4,125
Certificates of deposit	7,511		3		(7		)	7,507
Government municipal bonds	1,996		—		(3		)	1,993
Non-current marketable securities	13,645		3		(23		)	13,625
Total marketable securities	$	60,869	$	11	$	(63	)	$	60,817


(1)	Included in amortized cost and fair value is purchased and accrued interest of $252.

At September 30, 2014 our marketable securities were (in thousands):



	Amortized Cost (1)		Unrealized Gains		Unrealized Losses			Fair Value (1)
Current marketable securities:
Corporate bonds	$	24,668	$	1	$	(22	)	$	24,647
Commercial paper	3,998		—		(1		)	3,997
Certificates of deposit	4,252		2		—			4,254
Current marketable securities	32,918		3		(23		)	32,898
Non-current marketable securities:
Corporate bonds	2,051		—		(4		)	2,047
Certificates of deposit	9,502		14		(22		)	9,494
Non-current marketable securities	11,553		14		(26		)	11,541
Total marketable securities	$	44,471	$	17	$	(49	)	$	44,439


(1)	Included in amortized cost and fair value is purchased and accrued interest of $629.

Schedule of Unrealized Losses on Available-for-Sale Securities



	September 30, 2015
	Less than 12 Months					More than 12 Months
	Fair Value		Unrealized Losses			Fair Value		Unrealized Losses
Corporate bonds	$	33,664	$	(52	)	$	—	$	—
Commercial paper	5,987		(1		)	—		—
Certificates of deposit	4,244		(6		)	499		(1		)
Government municipal bonds	3,159		(3		)	—		—
Total	$	47,054	$	(62	)	$	499	$	(1	)



	September 30, 2014
	Less than 12 Months					More than 12 Months
	Fair Value		Unrealized Losses			Fair Value		Unrealized Losses
Corporate bonds	$	23,475	$	(26	)	$	—	$	—
Commercial paper	3,998		(1		)	—		—
Certificates of deposit	2,980		(20		)	748		(2		)
Total	$	30,453	$	(47	)	$	748	$	(2	)

- Definition

Tabular disclosure of marketable securities. This may consist of investments in certain debt and equity securities, short-term investments and other assets.

+ References+ Details

Fair Value Measurements (Tables)

12 Months Ended

Sep. 30, 2015

Fair Value Disclosures [Abstract]

Fair Value of Assets Measured on Recurring Basis

The following tables provide information by level for financial assets that are measured at fair value on a recurring basis (in thousands):



			Fair Value Measurements at September 30, 2015 using:
	Total carrying value at September 30, 2015		Quoted price in active markets (Level 1)		Significant other observable inputs (Level 2)		Significant unobservable inputs (Level 3)
Cash equivalents:
Money market	$	14,436	$	14,436	$	—	$	—
Available-for-sale marketable securities:
Corporate bonds	35,839		—		35,839		—
Commercial paper	7,985		—		7,985		—
Certificates of deposit	13,768		—		13,768		—
Government municipal bonds	3,225		—		3,225		—
Total cash equivalents and marketable securities measured at fair value	$	75,253	$	14,436	$	60,817	$	—



			Fair Value Measurements at September 30, 2014 using:
	Total carrying value at September 30, 2014		Quoted price in active markets (Level 1)		Significant other observable inputs (Level 2)		Significant unobservable inputs (Level 3)
Cash equivalents:
Money market	$	19,630	$	19,630	$	—	$	—
Available-for-sale marketable securities:
Corporate bonds	26,694		—		26,694		—
Commercial paper	3,997		—		3,997		—
Certificates of deposit	13,748		—		13,748		—
Total cash equivalents and marketable securities measured at fair value	$	64,069	$	19,630	$	44,439	$	—

Product Warranty Obligation (Tables)

12 Months Ended

Sep. 30, 2015

Product Warranties Disclosures [Abstract]

Schedule of Product Warranty Accrual

The following table summarizes the activity associated with the product warranty accrual (in thousands) and is listed on our Consolidated Balance Sheets under Current Liabilities:



	Balance at		Warranties		Settlements			Balance at
Fiscal year	October 1		issued		made			September 30
2015	$	862	$	967	$	(815	)	$	1,014
2014	$	1,063	$	627	$	(828	)	$	862
2013	$	1,021	$	669	$	(627	)	$	1,063

Restructuring (Tables)

12 Months Ended

Sep. 30, 2015

Restructuring and Related Activities [Abstract]

Schedule of Restructuring Reserve

Below is a summary of the restructuring charges and other activity within the restructuring accrual (in thousands):



	2015 Restructuring			2014 Restructuring			2013 Restructuring			2012 Restructuring
	Employee Termination Costs			Employee Termination Costs			Employee Termination Costs			Employee Termination Costs			Other			Total
Balance at September 30, 2012	$	—		$	—		$	—		$	13		108			$	121
Restructuring charge	—			—			350			—			—			350
Payments	—			—			—			—			(84		)	(84		)
Reversals	—			—			—			(13		)	(24		)	(37		)
Balance at September 30, 2013	—			—			350			—			—			350
Restructuring charge	—			152			—			—			—			152
Payments	—			(152		)	(279		)	—			—			(431		)
Reversals	—			—			(71		)	—			—			(71		)
Balance at September 30, 2014	—			—			—			—			—			—
Restructuring charge	518			—			—			—			—			518
Payments	(509		)	—			—			—			—			(509		)
Reversals	(9		)	—			—			—			—			(9		)
Balance at September 30, 2015	$	—		$	—		$	—		$	—		$	—		$	—

Income Taxes (Tables)

12 Months Ended

Sep. 30, 2015

Income Tax Disclosure [Abstract]

Schedule of Components of Income Taxes

The components of income before income taxes are as follows (in thousands):



	Fiscal years ended September 30,
	2015		2014			2013
United States	$	2,462	$	(5,097	)	$	(395	)
International	6,183		5,894			8,633
Income before income taxes	$	8,645	$	797		$	8,238

Schedule of Components of Income Tax Provision (Benefit)

The components of the income tax provision (benefit) are as follows (in thousands):



	Fiscal years ended September 30,
	2015			2014			2013
Current:
Federal	$	240		$	(309	)	$	1,418
State	308			(58		)	263
Foreign	2,278			2,196			3,148
Deferred:
U.S.	(566		)	(2,623		)	(2,270		)
Foreign	(203		)	(160		)	(126		)
Income tax provision (benefit)	$	2,057		$	(954	)	$	2,433

Schedule of Net Deferred Tax Asset

The net deferred tax asset consists of the following (in thousands):



	As of September 30,
	2015			2014
Current deferred tax asset	$	3,379		$	3,221
Non-current deferred tax asset	5,666			7,383
Current deferred tax liability	(36		)	—
Non-current deferred tax liability	(135		)	(272		)
Net deferred tax asset	$	8,874		$	10,332

Uncollectible accounts and other reserves	$	1,075		$	1,023
Depreciation and amortization	190			276
Inventories	999			1,297
Compensation costs	7,148			8,606
Tax carryforwards	1,185			1,347
Valuation allowance	(862		)	(572		)
Identifiable intangible assets	(861		)	(1,645		)
Net deferred tax asset	$	8,874		$	10,332

Schedule of Effective Income Tax Rate Reconciliation

The reconciliation of the statutory federal income tax amount to our income tax provision (benefit) is as follows (in thousands):



	Fiscal years ended September 30,
	2015			2014			2013
Statutory income tax amount	$	2,939		$	271		$	2,801
Increase (decrease) resulting from:
State taxes, net of federal benefits	(222		)	(281		)	(32		)
Utilization of tax credits	(250		)	(76		)	(601		)
Manufacturing deduction	(285		)	(92		)	(65		)
Discrete tax benefits	(845		)	(1,470		)	(863		)
Foreign operations	181			316			166
Valuation reserve	297			11			65
Adjustment of tax contingency reserves	71			168			800
Meals and entertainment	93			99			80
Employee stock purchase plan	76			85			77
Other, net	2			15			5
Income tax provision (benefit)	$	2,057		$	(954	)	$	2,433

Schedule of Unrecognized Tax Benefits

A reconciliation of the beginning and ending amount of unrecognized tax benefits is (in thousands):



	Fiscal years ended September 30,
	2015			2014			2013
Unrecognized tax benefits at beginning of fiscal year	$	2,301		$	3,332		$	2,720
Increases related to:
Prior year income tax positions	110			181			162
Current year income tax positions	144			148			733
Decreases related to:
Prior year income tax positions	(255		)	(1,105		)	—
Settlements	(74		)	(95		)	—
Expiration of statute of limitations	(608		)	(160		)	(283		)
Unrecognized tax benefits at end of fiscal year	$	1,618		$	2,301		$	3,332

Stock-Based Compensation (Tables)

12 Months Ended

Sep. 30, 2015

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Stock-Based Compensation Expense

Stock-based compensation expense is included in the consolidated results of operations as follows (in thousands):



	Fiscal years ended September 30,
	2015			2014			2013
Cost of sales	$	356		$	345		$	183
Sales and marketing	1,197			1,179			1,261
Research and development	785			735			772
General and administrative	1,963			2,071			1,556
Stock-based compensation before income taxes	4,301			4,330			3,772
Income tax benefit	(1,493		)	(1,491		)	(1,192		)
Stock-based compensation after income taxes	$	2,808		$	2,839		$	2,580

Schedule of Stock Option Activity

The following table summarizes our stock option activity (in thousands, except per common share amounts):



	Options Outstanding		Weighted Average Exercised Price	Weighted Average Contractual Term (in years)	Aggregate Intrinsic Value (1)
Balance at September 30, 2014	6,029		$10.61
Granted	810		8.12
Exercised	(739	)	8.87
Forfeited / Canceled	(1,300	)	11.55
Balance at September 30, 2015	4,800		$10.21	4.8	$	9,163

Exercisable at September 30, 2015	3,540		$10.66	4.1	$	5,575

Schedule of Valuation Assumptions



	Fiscal years ended September 30,
	2015		2014		2013
Weighted average per option grant date fair value	$	2.98	$	4.35	$	3.77
Assumptions used for option grants:
Risk free interest rate	1.57% - 1.85%		1.76% - 2.02%		0.88% - 1.78%
Expected term	6.00 years		6.00 years		6.25 years
Expected volatility	32% - 36%		38% - 40%		40%
Weighted average volatility	35%		40%		40%
Expected dividend yield	0		0		0

Schedule of Weighted Average Exercise Price Range and Remaining Contractual Life

At September 30, 2015, the weighted average exercise price and remaining life of the stock options are as follows (in thousands, except remaining life and exercise price):



Options Outstanding					Options Exercisable
Range of Exercise Prices	Options Outstanding	Weighted Average Remaining Contractual Life (In Years)	Weighted Average Exercise Price		Number of Shares Vested	Weighted Average Exercise Price
$7.40 - $8.03	777	5.32	$	7.74	439	$	8.01
$8.04 - $9.35	1,006	6.10	$	8.79	521	$	8.98
$9.36 - $9.95	751	4.94	$	9.69	709	$	9.69
$9.96 - $10.81	1,119	6.05	$	10.66	724	$	10.68
$10.82 - $13.41	883	2.00	$	12.41	883	$	12.41
$13.42 - $14.75	27	3.22	$	14.35	27	$	14.35
$14.76 - $15.23	237	2.05	$	15.23	237	$	15.23
$7.40 - $15.23	4,800	4.81	$	10.21	3,540	$	10.66

Schedule of Nonvested Restricted Stock Units

A summary of our non-vested restricted stock units as of September 30, 2015 and changes during the twelve months then ended is presented below (in thousands, except per common share amounts):



	Number of Awards		Weighted Average Grant Date Fair Value
Nonvested at September 30, 2014	171		$	9.35
Granted	503		$	8.27
Vested	(91	)	$	9.66
Canceled	(40	)	$	7.77
Nonvested at September 30, 2015	543		$	8.41

Commitments (Tables)

12 Months Ended

Sep. 30, 2015

Leases, Operating [Abstract]

Schedule of Future Minimum Rental Payments for Operating Leases

The following schedule reflects future minimum rental commitments under noncancelable operating leases (in thousands):



Fiscal year	Amount
2016	$	1,993
2017	1,127
2018	648
2019	444
2020	40
Thereafter	—
Total minimum payments required	$	4,252

Schedule of Rent Expense

The following schedule shows the composition of total rental expense for all operating leases for the years ended September 30 (in thousands):



	Fiscal years ended September 30,
	2015			2014			2013
Rentals	$	2,591		$	2,967		$	3,053
Less: sublease rentals	(56		)	(24		)	(31		)
Total rental expense	$	2,535		$	2,943		$	3,022

Quarterly Financial Data (Tables)

12 Months Ended

Sep. 30, 2015

Quarterly Financial Information Disclosure [Abstract]

Schedule of Quarterly Financial Data (Unaudited)

(in thousands, except per common share data)



	Quarter ended
	Dec. 31			March 31		June 30			Sept. 30
Fiscal 2015
Revenue	$	48,723		$	53,151	$	54,538		$	56,446
Gross profit	21,922			24,078		25,349			26,682
Net (loss) income (1)(2)(3)	(339		)	1,446		2,496			2,985
Net (loss) income per common share - basic	(0.01		)	0.06		0.10			0.12
Net (loss) income per common share - diluted	(0.01		)	0.06		0.10			0.12

Fiscal 2014
Revenue	$	47,322		$	45,882	$	47,885		$	51,612
Gross profit	22,908			21,780		22,149			23,647
Net income (loss) (1)	688			738		(101		)	426
Net income per common share - basic	0.03			0.03		—			0.02
Net income per common share - diluted	0.03			0.03		—			0.02

(1)


(2)	In the second quarter of fiscal 2015, we recorded a business restructuring accrual of $0.5 million ($0.3 million after tax).

(3)

Subsequent Event (Tables)

12 Months Ended

Sep. 30, 2015

Subsequent Events [Abstract]

Summary of proceeds from discontinued operations

Below is a summary of the proceeds (in thousands):



Cash due at closing	$	4,000
Less: Employee related liabilities	(1,134		)
Net cash proceeds at closing	2,866
Deferred payment due October 23, 2016	3,000
Deferred payment due October 23, 2017	2,000
Total proceeds	$	7,866

- Definition

Tabular disclosure of information related to a disposal group. Includes, but is not limited to, a discontinued operation, disposal classified as held-for-sale or disposed of by means other than sale or disposal of an individually significant component.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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+ Details

Summary of Significant Accounting Policies (Identifiable Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Finite-Lived Intangible Assets [Line Items]
Intangible impairment charge	$ 361	$ 0	$ 0	$ 361
Minimum
Finite-Lived Intangible Assets [Line Items]
Estimated useful life		3 years
Maximum
Finite-Lived Intangible Assets [Line Items]
Estimated useful life		13 years

Summary of Significant Accounting Policies (Goodwill) (Details) (USD $)	0 Months Ended
	Jun. 30, 2014	Sep. 30, 2015	Jun. 30, 2015	Sep. 30, 2014	Jun. 30, 2014 industry	Sep. 30, 2013	Sep. 30, 2012
Goodwill [Line Items]
Target companies equity benchmark					50.00%
Number of industries encompasses similar products					3
Control premium percent	35.00%
Market Capitalization			$ 238,600,000		$ 235,800,000
Carrying value		$ 274,938,000	$ 270,643,000	$ 265,298,000	$ 273,010,000	$ 274,243,000	$ 270,834,000
Percent fair value in excess of carrying value of goodwill			19.00%		17.00%
Minimum
Goodwill [Line Items]
Control premium percent	30.00%
Maximum
Goodwill [Line Items]
Control premium percent	40.00%

Summary of Significant Accounting Policies (Revenue Recognition) (Details)	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Hardware products
Concentration Risk [Line Items]
Percentage of revenue	91.80%	89.70%	88.60%
Service
Concentration Risk [Line Items]
Percentage of revenue	8.20%	10.30%	11.40%

Summary of Significant Accounting Policies (Net Income Per Common Share) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified

3 Months Ended

12 Months Ended

Sep. 30, 2015

Jun. 30, 2015

Mar. 31, 2015

Dec. 31, 2014

Sep. 30, 2014

Jun. 30, 2014

Mar. 31, 2014

Dec. 31, 2013

Sep. 30, 2015

Sep. 30, 2014

Sep. 30, 2013

Accounting Policies [Abstract]

Net income

$ 2,985

^[1],[2],[3]

$ 2,496

^[1],[2],[3]

$ 1,446

^[1],[2],[3]

$ (339)

^[1],[2],[3]

$ 426

^[1]

$ (101)

^[1]

$ 738

^[1]

$ 688

^[1]

$ 6,588

$ 1,751

$ 5,805

Denominator for basic net income per common share — weighted average shares outstanding

24,645,000

25,345,000

25,956,000

Effect of dilutive securities [Abstract]

Stock options and restricted stock units

582,000

385,000

281,000

Denominator for diluted net income per common share — adjusted weighted average shares

25,227,000

25,730,000

26,237,000

Net income per common share, basic (USD per share)

$ 0.12

$ 0.10

$ 0.06

$ (0.01)

$ 0.02

$ 0.00

$ 0.03

$ 0.27

$ 0.07

$ 0.22

Net income per common share, diluted (USD per share)

$ 0.12

$ 0.10

$ 0.06

$ (0.01)

$ 0.02

$ 0.00

$ 0.03

$ 0.26

$ 0.07

$ 0.22

Antidilutive securities excluded from computation of earnings per share

3,016,911

3,284,993

3,939,541

[1]	During fiscal 2015 and 2014, we recorded net tax benefits of $0.9 million and $1.4 million, respectively. We recorded a benefit of $0.5 million in the first quarter of fiscal 2015 resulting from the reinstatement of the research and development tax credit for calendar year 2014, reversal of income tax reserves due to the expiration of the statute of limitations from various U.S. and foreign tax jurisdictions and reversal of tax reserves due to the resolution of tax audits. In the third quarter of fiscal 2015, we recorded a tax benefit of $0.4 million primarily due to the reversal of reserves for state research and development tax credits and transfer pricing, partially offset by an adjustment of the state rate on net deferred tax assets. We recorded net tax benefits of $0.2 million in the first quarter of fiscal 2014 resulting from the release of income tax reserves due to the expiration of the statute of limitations from various U.S. and foreign tax jurisdictions. During the second quarter of fiscal 2014, we recorded a tax benefit of $1.1 million resulting from re-measurement and reversal of certain income tax reserves as a result of the conclusion of a federal income tax audit for fiscal 2012. In the third quarter of fiscal 2014, we recorded a tax benefit of $0.1 million primarily for a valuation allowance reversal associated with the reassessment of state research and development tax credits.
[2]	In the second quarter of fiscal 2015, we recorded a business restructuring accrual of $0.5 million ($0.3 million after tax).
[3]	During fiscal 2015, we recorded a gain of $1.4 million from the settlement of a property and casualty insurance claim related to the replacement of our capital equipment destroyed in the fire at our subcontract manufacturer's location. We recorded $1.0 million ($0.6 million after tax) during the second quarter of fiscal 2015 and $0.4 million ($0.3 million after tax) during the third quarter of fiscal 2015.

- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

+ References+ Details

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

+ References+ Details

- Definition

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

+ References+ Details

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References+ Details

Acquisition (Details) (Etherios, Inc, USD $) In Millions, except Share data, unless otherwise specified	0 Months Ended	12 Months Ended
	Oct. 31, 2012	Sep. 30, 2013
Business Acquisition [Line Items]
Total purchase price	$ 20.4
Cash, including cash in escrow	13.7
Cash acquired	0.8
Common stock	6.7
Amount in escrow	2.35
Escrow holdback	0.3
Escrow cash	2.05
Purchase accounting adjustment decrease		0.1
Net Tangible Assets purchase accounting adjustment decrease		0.3
Goodwill, Purchase Accounting Adjustments		0.2
Goodwill		17.3
Acquisition related costs		$ 0.2
Maximum
Business Acquisition [Line Items]
Escrow cash period	18 months
Common Stock
Business Acquisition [Line Items]
Number of shares	715,571
Common stock issued per common share	$ 9.42

Goodwill and other Identifiable Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount		$ 76,874	$ 80,413
Accumulated amortization		(72,695)	(73,628)
Net		4,179	6,785
Intangible impairment charge	361	0	0	361
Purchased and Core Technology
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount		45,449	45,952
Accumulated amortization		(45,424)	(45,162)
Net		25	790
Intangible impairment charge	200
License Agreements
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount		18	2,440
Accumulated amortization		(4)	(2,440)
Net		14	0
Intangible impairment charge	100
Patents and Trademarks
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount		11,817	11,667
Accumulated amortization		(10,568)	(9,799)
Net		1,249	1,868
Intangible impairment charge	100
Customer Relationships
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount		18,490	18,894
Accumulated amortization		(16,057)	(15,445)
Net		2,433	3,449
Non-compete Agreements
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount		1,100	1,100
Accumulated amortization		(642)	(422)
Net		458	678
Order Backlog
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount		0	360
Accumulated amortization		0	(360)
Net		$ 0	$ 0

Goodwill and other Identifiable Intangible Assets (Amortization Expense) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization expense	$ 2,910	$ 3,589	$ 4,416
2016	1,944
2017	1,061
2018	487
2019	451
2020	$ 168

Goodwill and other Identifiable Intangible Assets (Goodwill) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Goodwill [Roll Forward]
Beginning balance	$ 103,398	$ 103,569
Foreign currency translation adjustment	(1,301)	(171)
Ending balance	$ 102,097	$ 103,398

Segment Information and Major Customers (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Sep. 30, 2015 customer	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014 customer	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2015 customer segment	Sep. 30, 2014 customer	Sep. 30, 2013 customer
Segment Reporting Information [Line Items]
Sales Revenue, Goods, Net									$ 195,497	$ 172,846	$ 173,078
Sales Revenue, Services, Net									17,361	19,855	22,303
Number of operating segments									1
Number of reportable segments									1
Total revenue	56,446	54,538	53,151	48,723	51,612	47,885	45,882	47,322	212,858	192,701	195,381
Total property, equipment and improvements	14,357				13,231				14,357	13,231	13,910
Number of customer representing over ten percent of revenue									0	0	0
Number of customer representing over ten percent of consolidated accounts receivable	2				0				2	0
North America, primarily United States
Segment Reporting Information [Line Items]
Total revenue									136,603	116,421	116,541
United States
Segment Reporting Information [Line Items]
Total property, equipment and improvements	14,103				12,813				14,103	12,813	13,321
United States \| U.S. Export Net Sales
Segment Reporting Information [Line Items]
Percentage of concentration									37.70%	41.20%	41.70%
United States \| Accounts Receivable \| Customer 1
Segment Reporting Information [Line Items]
Percentage of concentration									10.20%
United States \| Accounts Receivable \| Customer 2
Segment Reporting Information [Line Items]
Percentage of concentration									11.00%
Europe, Middle East and Africa
Segment Reporting Information [Line Items]
Total revenue									47,523	47,729	48,815
Asia
Segment Reporting Information [Line Items]
Total revenue									22,907	22,762	24,507
Latin America
Segment Reporting Information [Line Items]
Total revenue									5,825	5,789	5,518
International, primarily Europe
Segment Reporting Information [Line Items]
Total property, equipment and improvements	254				418				254	418	589
Cellular routers and gateways
Segment Reporting Information [Line Items]
Sales Revenue, Goods, Net									58,666	39,215	33,227
RF
Segment Reporting Information [Line Items]
Sales Revenue, Goods, Net									34,373	29,094	29,157
Embedded
Segment Reporting Information [Line Items]
Sales Revenue, Goods, Net									51,063	49,681	57,597
Network
Segment Reporting Information [Line Items]
Sales Revenue, Goods, Net									51,395	54,856	53,097
Growth hardware product and all services
Segment Reporting Information [Line Items]
Total revenue									133,572	109,763	110,350
Mature hardware products
Segment Reporting Information [Line Items]
Total revenue									$ 79,286	$ 82,938	$ 85,031

Selected Balance Sheet Data (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Accounts receivable, net:
Accounts receivable	$ 29,688	$ 28,943
Less allowance for doubtful accounts	483	367
Total accounts receivable, net	29,205	28,576
Inventories:
Raw materials	26,037	26,402
Work in process	598	315
Finished goods	5,242	4,530
Total Inventories	31,877	31,247
Property, Plant and Equipment, Net
Total property, equipment and improvements, gross	37,541	35,424
Less accumulated depreciation and amortization	23,184	22,193
Total property, equipment and improvements, net	14,357	13,231	13,910
Land
Property, Plant and Equipment, Net
Total property, equipment and improvements, gross	1,800	1,800
Buildings
Property, Plant and Equipment, Net
Total property, equipment and improvements, gross	10,522	10,522
Improvements
Property, Plant and Equipment, Net
Total property, equipment and improvements, gross	3,328	3,420
Equipment
Property, Plant and Equipment, Net
Total property, equipment and improvements, gross	15,691	13,646
Purchased Software
Property, Plant and Equipment, Net
Total property, equipment and improvements, gross	3,458	3,559
Furniture and Fixtures
Property, Plant and Equipment, Net
Total property, equipment and improvements, gross	$ 2,742	$ 2,477

Marketable Securities (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2015 Security	Sep. 30, 2014	Sep. 30, 2013
Schedule of Available-for-sale Securities [Line Items]
Number of securities below amortized cost basis	44
Number of securities	81
Proceeds from maturities of marketable securities	$ 38,028	$ 47,420	$ 63,089
Current Assets
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, next twelve months, maximum year mature	1 year
Non-current Assets
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, year two through five, maximum year mature	3 years

Marketable Securities (Fair Value to Amortized Cost) (Details) (USD $)
In Thousands, unless otherwise specified

Sep. 30, 2015

Sep. 30, 2014

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale securities, amortized cost basis

$ 60,869

^[1]

$ 44,471

^[2]

Available-for-sale securities, unrealized gains

Available-for-sale securities, unrealized losses

(63)

(49)

Available-for-sale marketable securities, fair value

60,817

^[1]

44,439

^[2]

Purchased and accrued interest

252

629

Current Assets

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale securities, amortized cost basis

47,224

32,918

Available-for-sale securities, unrealized gains

Available-for-sale securities, unrealized losses

(40)

(23)

Available-for-sale marketable securities, fair value

47,192

32,898

Current Assets | Corporate bonds

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale securities, amortized cost basis

31,753

24,668

Available-for-sale securities, unrealized gains

Available-for-sale securities, unrealized losses

(39)

(22)

Available-for-sale marketable securities, fair value

31,714

24,647

Current Assets | Commercial paper

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale securities, amortized cost basis

7,986

3,998

Available-for-sale securities, unrealized gains

Available-for-sale securities, unrealized losses

(1)

Available-for-sale marketable securities, fair value

7,985

3,997

Current Assets | Certificates of deposit

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale securities, amortized cost basis

6,253

4,252

Available-for-sale securities, unrealized gains

Available-for-sale securities, unrealized losses

Available-for-sale marketable securities, fair value

6,261

4,254

Current Assets | Government municipal bonds

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale securities, amortized cost basis

1,232

Available-for-sale securities, unrealized gains

Available-for-sale securities, unrealized losses

Available-for-sale marketable securities, fair value

1,232

Non-current Assets

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale securities, amortized cost basis

13,645

11,553

Available-for-sale securities, unrealized gains

Available-for-sale securities, unrealized losses

(23)

(26)

Available-for-sale marketable securities, fair value

13,625

11,541

Non-current Assets | Corporate bonds

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale securities, amortized cost basis

4,138

2,051

Available-for-sale securities, unrealized gains

Available-for-sale securities, unrealized losses

(13)

(4)

Available-for-sale marketable securities, fair value

4,125

2,047

Non-current Assets | Certificates of deposit

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale securities, amortized cost basis

7,511

9,502

Available-for-sale securities, unrealized gains

Available-for-sale securities, unrealized losses

(7)

(22)

Available-for-sale marketable securities, fair value

7,507

9,494

Non-current Assets | Government municipal bonds

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale securities, amortized cost basis

1,996

Available-for-sale securities, unrealized gains

Available-for-sale securities, unrealized losses

(3)

Available-for-sale marketable securities, fair value

$ 1,993

[1]	Included in amortized cost and fair value is purchased and accrued interest of $252.
[2]	Included in amortized cost and fair value is purchased and accrued interest of $629

Marketable Securities (Fair Value and Gross Unrealized Losses for AFS) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2015	Sep. 30, 2014
Schedule of Available-for-sale Securities [Line Items]
Fair value of available-for-sale securities in continuous unrealized loss position for less than twelve months	$ 47,054	$ 30,453
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(62)	(47)
Fair value of available-for-sale securities in continuous unrealized loss position for twelve months or longer	499	748
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(1)	(2)
Corporate bonds
Schedule of Available-for-sale Securities [Line Items]
Fair value of available-for-sale securities in continuous unrealized loss position for less than twelve months	33,664	23,475
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(52)	(26)
Fair value of available-for-sale securities in continuous unrealized loss position for twelve months or longer	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	0
Commercial paper
Schedule of Available-for-sale Securities [Line Items]
Fair value of available-for-sale securities in continuous unrealized loss position for less than twelve months	5,987	3,998
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(1)	(1)
Fair value of available-for-sale securities in continuous unrealized loss position for twelve months or longer	0	0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	0	0
Certificates of deposit
Schedule of Available-for-sale Securities [Line Items]
Fair value of available-for-sale securities in continuous unrealized loss position for less than twelve months	4,244	2,980
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(6)	(20)
Fair value of available-for-sale securities in continuous unrealized loss position for twelve months or longer	499	748
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	(1)	(2)
Government municipal bonds
Schedule of Available-for-sale Securities [Line Items]
Fair value of available-for-sale securities in continuous unrealized loss position for less than twelve months	3,159
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	(3)
Fair value of available-for-sale securities in continuous unrealized loss position for twelve months or longer	0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	$ 0

Fair Value Measurements (Details) (USD $)
In Thousands, unless otherwise specified

Sep. 30, 2015

Sep. 30, 2014

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Available-for-sale marketable securities

$ 60,817

^[1]

$ 44,439

^[2]

Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Total cash equivalents and marketable securities measured at fair value

14,436

19,630

Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Total cash equivalents and marketable securities measured at fair value

60,817

44,439

Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Total cash equivalents and marketable securities measured at fair value

Money Market Funds | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Cash equivalents

14,436

19,630

Money Market Funds | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Cash equivalents

Money Market Funds | Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Cash equivalents

Corporate bonds | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Available-for-sale marketable securities

Corporate bonds | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Available-for-sale marketable securities

35,839

26,694

Corporate bonds | Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Available-for-sale marketable securities

Commercial paper | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Available-for-sale marketable securities

Commercial paper | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Available-for-sale marketable securities

7,985

3,997

Commercial paper | Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Available-for-sale marketable securities

Certificates of deposit | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Available-for-sale marketable securities

Certificates of deposit | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Available-for-sale marketable securities

13,768

13,748

Certificates of deposit | Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Available-for-sale marketable securities

Government municipal bonds | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Available-for-sale marketable securities

Government municipal bonds | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Available-for-sale marketable securities

3,225

Government municipal bonds | Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Available-for-sale marketable securities

Estimate of Fair Value Measurement [Member] | Fair Value, Measurements, Recurring

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Total cash equivalents and marketable securities measured at fair value

75,253

64,069

Estimate of Fair Value Measurement [Member] | Money Market Funds | Fair Value, Measurements, Recurring

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Cash equivalents

14,436

19,630

Estimate of Fair Value Measurement [Member] | Corporate bonds | Fair Value, Measurements, Recurring

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Available-for-sale marketable securities

35,839

26,694

Estimate of Fair Value Measurement [Member] | Commercial paper | Fair Value, Measurements, Recurring

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Available-for-sale marketable securities

7,985

3,997

Estimate of Fair Value Measurement [Member] | Certificates of deposit | Fair Value, Measurements, Recurring

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Available-for-sale marketable securities

13,768

13,748

Estimate of Fair Value Measurement [Member] | Government municipal bonds | Fair Value, Measurements, Recurring

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Available-for-sale marketable securities

$ 3,225

[1]	Included in amortized cost and fair value is purchased and accrued interest of $252.
[2]	Included in amortized cost and fair value is purchased and accrued interest of $629

Product Warranty Obligation (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Standard Product Warranty Accrual [Roll Forward]
Beginning balance	$ 862	$ 1,063	$ 1,021
Warranties issued	967	627	669
Settlements made	(815)	(828)	(627)
Ending balance	$ 1,014	$ 862	$ 1,063

Restructuring (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended																		0 Months Ended	12 Months Ended		0 Months Ended	12 Months Ended			0 Months Ended	12 Months Ended	0 Months Ended	12 Months Ended
	Mar. 31, 2015	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2015 Employee Severance 2015 Restructuring	Sep. 30, 2014 Employee Severance 2015 Restructuring	Sep. 30, 2013 Employee Severance 2015 Restructuring	Sep. 30, 2015 Employee Severance 2014 Restructuring	Sep. 30, 2014 Employee Severance 2014 Restructuring	Sep. 30, 2013 Employee Severance 2014 Restructuring	Sep. 30, 2015 Employee Severance 2013 Restructuring	Sep. 30, 2014 Employee Severance 2013 Restructuring	Sep. 30, 2013 Employee Severance 2013 Restructuring	Sep. 30, 2015 Employee Severance 2012 Restructuring	Sep. 30, 2014 Employee Severance 2012 Restructuring	Sep. 30, 2013 Employee Severance 2012 Restructuring	Sep. 30, 2015 Facility Closing 2012 Restructuring	Sep. 30, 2014 Facility Closing 2012 Restructuring	Sep. 30, 2013 Facility Closing 2012 Restructuring	Feb. 20, 2015 UNITED STATES 2015 Restructuring employee	Sep. 30, 2013 UNITED STATES 2013 Restructuring employee	Sep. 30, 2012 UNITED STATES 2012 Restructuring employee	Feb. 20, 2015 UNITED STATES Employee Severance 2015 Restructuring	Sep. 30, 2013 UNITED STATES Employee Severance 2013 Restructuring	Sep. 30, 2012 UNITED STATES Employee Severance 2012 Restructuring	Sep. 30, 2012 UNITED STATES Facility Closing 2012 Restructuring	Jan. 22, 2015 INDIA 2015 Restructuring employee	Sep. 30, 2014 INDIA 2014 Restructuring employee	Jan. 22, 2015 INDIA Employee Severance 2015 Restructuring	Sep. 30, 2014 INDIA Employee Severance 2014 Restructuring
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Number of Positions Eliminated																				21	15	30					38	40
Restructuring Reserve [Roll Forward]
Restructuring Reserve, beginning		$ 0	$ 350	$ 121	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 350	$ 0	$ 0	$ 0	$ 13	$ 0	$ 0	$ 108
Restructuring Charges	500	518	152	350	518	0	0	0	152	0	0	0	350	0	0	0	0	0	0			1,000	300	400	600	400			200	200
Payments for Restructuring		(509)	(431)	(84)	(509)	0	0	0	(152)	0	0	(279)	0	0	0	0	0	0	(84)
Restructuring Reserve, Accrual Adjustment		(9)	(71)	(37)	(9)	0	0	0	0	0	0	(71)	0	0	0	(13)	0	0	(24)
Restructuring Reserve, ending		$ 0	$ 0	$ 350	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 350	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0

- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

+ References+ Details

Income Taxes (Details) (USD $)	3 Months Ended					12 Months Ended
Income Taxes (Details) (USD $)	Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Income Taxes [Line Items]
Valuation allowance						$ 862,000	$ 572,000
Net tax benefit mostly related to reversal of tax reserves for federal income tax audit	400,000	500,000	100,000	1,100,000	200,000	900,000	1,400,000	800,000
Interest and penalties related to income tax matters in income tax expense						(100,000)	(200,000)
Accrued income tax penalties and interest for unrecognized tax benefits						300,000	400,000
Accumulated undistributed foreign earnings						28,200,000
Maximum
Income Taxes [Line Items]
Estimated unrecognized deferred tax liability						800,000
State and Local Jurisdiction
Income Taxes [Line Items]
State research and development tax credits						700,000
Foreign Tax Authority
Income Taxes [Line Items]
Non-U.S. operating losses						$ 500,000

- Definition

Amount of undistributed earnings of foreign subsidiaries intended to be permanently reinvested outside the country of domicile.

+ References+ Details

Income Taxes (Income Taxes) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Income Tax Disclosure [Abstract]
United States	$ 2,462	$ (5,097)	$ (395)
International	6,183	5,894	8,633
Income before income taxes	$ 8,645	$ 797	$ 8,238

Income Taxes (Income Tax Provision) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Current:
Federal	$ 240	$ (309)	$ 1,418
State	308	(58)	263
Foreign	2,278	2,196	3,148
Deferred:
U.S.	(566)	(2,623)	(2,270)
Foreign	(203)	(160)	(126)
Income tax provision (benefit)	$ 2,057	$ (954)	$ 2,433

- Definition

Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

+ References+ Details

- Definition

Amount of current state and local tax expense (benefit) pertaining to income (loss) from continuing operations.

+ References+ Details

- Definition

Amount of deferred federal income tax expense (benefit) pertaining to income (loss) from continuing operations.

+ References+ Details

- Definition

Amount of deferred foreign income tax expense (benefit) pertaining to income (loss) from continuing operations.

+ References+ Details

Income Taxes (Deferred Tax Assets) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2015	Sep. 30, 2014
Income Tax Disclosure [Abstract]
Current deferred tax asset	$ 3,379	$ 3,221
Non-current deferred tax asset	5,666	7,383
Current deferred tax liability	(36)	0
Non-current deferred tax liability	(135)	(272)
Net deferred tax asset	8,874	10,332
Uncollectible accounts and other reserves	1,075	1,023
Depreciation and amortization	190	276
Inventories	999	1,297
Compensation costs	7,148	8,606
Tax carryforwards	1,185	1,347
Valuation allowance	(862)	(572)
Indentifiable intangible assets	$ (861)	$ (1,645)

Income Taxes (Effective Income Tax Rate Reconciliation) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Income Tax Disclosure [Abstract]
Statutory income tax amount	$ 2,939	$ 271	$ 2,801
State taxes, net of federal benefits	(222)	(281)	(32)
Utilization of tax credits	(250)	(76)	(601)
Manufacturing deduction	(285)	(92)	(65)
Discrete tax benefits	(845)	(1,470)	(863)
Foreign operations	181	316	166
Valuation reserve	297	11	65
Adjustment of tax contingency reserves	71	168	800
Meals and entertainment	93	99	80
Employee stock purchase plan	76	85	77
Other, net	2	15	5
Income tax provision (benefit)	$ 2,057	$ (954)	$ 2,433

Income Taxes (Unrecognized Tax Benefits) (Details) (USD $)	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefits, beginning balance	$ 2,301,000	$ 3,332,000	$ 2,720,000
Increases related to prior year income tax positions	110,000	181,000	162,000
Increases related to current year income tax positions	144,000	148,000	733,000
Decreases related to prior year income tax positions	(255,000)	(1,105,000)	0
Decreases related to settlements	(74,000)	(95,000)	0
Decreases related to expiration of statute of limitations	(608,000)	(160,000)	(283,000)
Unrecognized tax benefits, ending balance	1,618,000	2,301,000	3,332,000
Income Tax Contingency [Line Items]
Unrecognized tax benefits that would impact effective tax rate	1,600,000
Expected change in unrecognized tax benefits, minimum	200,000
Unrecognized tax benefits	1,618,000	2,301,000	3,332,000
Noncurrent income taxes payable
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefits, ending balance	1,200,000
Income Tax Contingency [Line Items]
Unrecognized tax benefits	1,200,000
Noncurrent deferred tax assets
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefits, ending balance	400,000
Income Tax Contingency [Line Items]
Unrecognized tax benefits	$ 400,000

Stock-Based Compensation (Details) (USD $)	12 Months Ended							12 Months Ended		12 Months Ended	0 Months Ended		12 Months Ended	0 Months Ended	12 Months Ended				12 Months Ended
Stock-Based Compensation (Details) (USD $)	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2015 Stock Options	Sep. 30, 2015 Restricted Stock Units	Sep. 30, 2015 The 2014 Plan	Jan. 27, 2014 The 2014 Plan	Sep. 30, 2015 The 2014 Plan Stock Options	Jan. 28, 2013 The 2013 Plan	Sep. 30, 2015 The 2013 Plan Stock Options	Jan. 25, 2010 The Omnibus Plan	Dec. 04, 2009 The Omnibus Plan	Sep. 30, 2015 The Stock Option Plan and Non-Officer Plan Stock Options	Jan. 27, 2014 The Purchase Plan	Sep. 30, 2015 The Purchase Plan	Sep. 30, 2014 The Purchase Plan	Sep. 30, 2013 The Purchase Plan	Jan. 27, 2014 The Purchase Plan	Sep. 30, 2015 Director [Member] The 2014 Plan Restricted Stock Units	Sep. 30, 2015 Director [Member] The 2013 Plan Restricted Stock Units	Sep. 30, 2015 Executives and Employees [Member] The 2014 Plan Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized							2,250,000		1,750,000			5,750,000						2,800,000
Expiration period								8 years		8 years			10 years
Vesting period								4 years		4 years			4 years						1 year	1 year	4 years
Number of shares available for future grants						1,369,684
Number of additional shares authorized											2,500,000			800,000
Proceeds from stock option plan transactions	$ 6,559,000	$ 3,689,000	$ 2,193,000
Excess tax benefits from stock-based compensation	0	(44,000)	(67,000)
Number of continuous days of service															90 days
Number of hours per week employed															20 hours
Percent of market value															85.00%
Offering period															3 months
Employee contributions															900,000	1,000,000	1,000,000
Common shares issued to employees															123,847	129,449	128,853
Shares available for future issuance															617,531
Total intrinsic value of all options exercised	900,000	500,000	500,000
Forfeiture rate	6.00%
Total unrecognized compensation cost nonvested awards				3,600,000
Weighted average period, unrecognized compensation cost, nonvested awards				2 years 8 months 12 days	1 year 5 months 1 day
Total grant date fair value of shares vested	2,900,000	800,000	3,100,000
Total unrecognized compensation cost, restricted stock units					$ 3,200,000

Stock-Based Compensation (Stock-Based Compensation Expense) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation before income taxes	$ 4,301	$ 4,330	$ 3,772
Income tax benefit	(1,493)	(1,491)	(1,192)
Stock-based compensation after income taxes	2,808	2,839	2,580
Cost of Sales
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation before income taxes	356	345	183
Sales and Marketing
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation before income taxes	1,197	1,179	1,261
Research and Development
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation before income taxes	785	735	772
General and Administrative
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation before income taxes	$ 1,963	$ 2,071	$ 1,556

Stock-Based Compensation (Options and Common Shares Reserved for Grant) (Details) (Stock Options, USD $)
In Thousands, except Per Share data, unless otherwise specified

12 Months Ended

Sep. 30, 2015

Stock Options

Options Outstanding [Roll Forward]

Options Outstanding, Beginning Balance

6,029

Options Outstanding, Granted

810

Options Outstanding, Exercised

(739)

Options Outstanding, Forfeited / Cancelled

(1,300)

Options Outstanding, Ending Balance

4,800

Options Outstanding, Exercisable

3,540

Weighted Average Exercise Price [Roll Forward]

Weighted Average Exercise Price, Beginning Balance

$ 10.61

Weighted Average Exercise Price, Granted

$ 8.12

Weighted Average Exercise Price, Exercised

$ 8.87

Weighted Average Exercise Price, Forfeited / Cancelled

$ 11.55

Weighted Average Exercise Price, Ending Balance

$ 10.21

Weighted Average Exercise Price, Exercisable

$ 10.66

Weighted Average Remaining Contractual Term [Abstract]

Weighted Average Remaining Contractual Term, Outstanding

4 years 9 months 18 days

Weighted Average Remaining Contractual Term, Exercisable

4 years 1 month 6 days

Aggregate Intrinsic Value [Abstract]

Aggregate Intrinsic Value, Outstanding

$ 9,163

^[1]

Aggregate Intrinsic Value, Exercisable

$ 5,575

^[1]

Closing Stock Price

$ 11.79

[1]	The aggregate intrinsic value represents the total pre-tax intrinsic value, based on our closing stock price of $11.79 as of September 30, 2015, which would have been received by the option holders had all option holders exercised their options as of that date.

Stock-Based Compensation (Fair Value Assumptions) (Details) (Stock Options, USD $)	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average per option grant date fair value	$ 2.98	$ 4.35	$ 3.77
Assumptions Used For Options Grants [Abstract]
Risk free interest rate, minimum	1.57%	1.76%	0.88%
Risk free interest rate, maximum	1.85%	2.02%	1.78%
Expected term	6 years	6 years	6 years 3 months
Expected volatility rate, minimum	32.00%	38.00%	40.00%
Expected volatility rate, maximum	36.00%	40.00%
Weighted average volatility	35.00%	40.00%	40.00%
Expected dividend yield	0.00%	0.00%	0.00%

Stock-Based Compensation (Exercise Price Range) (Details) (Stock Options, USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Sep. 30, 2015
$7.40 - $8.03 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Lower Range	$ 7.40
Exercise Price Range, Upper Range	$ 8.03
Options Outstanding	777
Weighted Average Remaining Contractual Term	5 years 3 months 25 days
Weighted Average Exercise Price, Options Outstanding	$ 7.74
Number of Shares Vested, Options Exercisable	439
Weighted Average Exercise Price, Options Exercisable	$ 8.01
$8.04 - $9.35 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Lower Range	$ 8.04
Exercise Price Range, Upper Range	$ 9.35
Options Outstanding	1,006
Weighted Average Remaining Contractual Term	6 years 1 month 6 days
Weighted Average Exercise Price, Options Outstanding	$ 8.79
Number of Shares Vested, Options Exercisable	521
Weighted Average Exercise Price, Options Exercisable	$ 8.98
$9.36 - $9.95 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Lower Range	$ 9.36
Exercise Price Range, Upper Range	$ 9.95
Options Outstanding	751
Weighted Average Remaining Contractual Term	4 years 11 months 8 days
Weighted Average Exercise Price, Options Outstanding	$ 9.69
Number of Shares Vested, Options Exercisable	709
Weighted Average Exercise Price, Options Exercisable	$ 9.69
$9.96 - $10.81 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Lower Range	$ 9.96
Exercise Price Range, Upper Range	$ 10.81
Options Outstanding	1,119
Weighted Average Remaining Contractual Term	6 years 0 months 18 days
Weighted Average Exercise Price, Options Outstanding	$ 10.66
Number of Shares Vested, Options Exercisable	724
Weighted Average Exercise Price, Options Exercisable	$ 10.68
$10.82 - $13.41 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Lower Range	$ 10.82
Exercise Price Range, Upper Range	$ 13.41
Options Outstanding	883
Weighted Average Remaining Contractual Term	2 years
Weighted Average Exercise Price, Options Outstanding	$ 12.41
Number of Shares Vested, Options Exercisable	883
Weighted Average Exercise Price, Options Exercisable	$ 12.41
$13.42 - $14.75 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Lower Range	$ 13.42
Exercise Price Range, Upper Range	$ 14.75
Options Outstanding	27
Weighted Average Remaining Contractual Term	3 years 2 months 19 days
Weighted Average Exercise Price, Options Outstanding	$ 14.35
Number of Shares Vested, Options Exercisable	27
Weighted Average Exercise Price, Options Exercisable	$ 14.35
$14.76 - $15.23 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Lower Range	$ 14.76
Exercise Price Range, Upper Range	$ 15.23
Options Outstanding	237
Weighted Average Remaining Contractual Term	2 years 0 months 18 days
Weighted Average Exercise Price, Options Outstanding	$ 15.23
Number of Shares Vested, Options Exercisable	237
Weighted Average Exercise Price, Options Exercisable	$ 15.23
$7.40 - $15.23 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Lower Range	$ 7.40
Exercise Price Range, Upper Range	$ 15.23
Options Outstanding	4,800
Weighted Average Remaining Contractual Term	4 years 9 months 21 days
Weighted Average Exercise Price, Options Outstanding	$ 10.21
Number of Shares Vested, Options Exercisable	3,540
Weighted Average Exercise Price, Options Exercisable	$ 10.66

Stock-Based Compensation (Non-Vested Options) (Details) (Restricted Stock Units, USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Sep. 30, 2015
Restricted Stock Units
Nonvested Number of Restricted Stock Units [Roll Forward]
Number of Restricted Stock Units, Beginning Balance	171
Number of Restricted Stock Units, Granted	503
Number of Restricted Stock Units, Vested	(91)
Number of Restricted Stock Units, Canceled	(40)
Number of Restricted Stock Units, Ending Balance	543
Nonvested Restricted Stock Units, Weighted Average Grant Date Fair Value per Common Share [Roll Forward]
Restricted Stock Units, Weighted Average Grant Date Fair Value per Common Share, Beginning Balance	$ 9.35
Restricted Stock Units, Weighted Average Grant Date Fair Value per Common Share, Granted	$ 8.27
Restricted Stock Units, Weighted Average Grant Date Fair Value per Common Share, Vested	$ 9.66
Restricted Stock Units, Weighted Average Grant Date Fair Value per Common Share, Canceled	$ 7.77
Restricted Stock Units, Weighted Average Grant Date Fair Value per Common Share, Ending Balance	$ 8.41

Common Stock Repurchase (Details) (USD $)	12 Months Ended			1 Months Ended			12 Months Ended
Common Stock Repurchase (Details) (USD $)	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013	Oct. 31, 2014 October 2013 authorized repurchase program	Oct. 29, 2013 October 2013 authorized repurchase program	Oct. 28, 2014 October 2014 authorized repurchase program	Sep. 30, 2015 Equity Incentive Plans	Sep. 30, 2014 Equity Incentive Plans	Sep. 30, 2013 Equity Incentive Plans
Stock repurchase program, authorized amount					$ 20,000,000	$ 15,000,000
Shares repurchased				287,787
Shares repurchased, value	2,339,000	15,802,000	14,058,000	2,200,000
Adjustment to satisfy withholding obligations							$ 100,000	$ 0	$ 0

Employee Benefit Plans (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Defined Contribution Plan Disclosure [Line Items]
Maximum annual contribution per employee percentage	25.00%
Matching contributions, amount	$ 1.7	$ 1.6	$ 1.4
Full Employer Match
Defined Contribution Plan Disclosure [Line Items]
Employers percent of matching contributions	100.00%
Percent of employees' gross pay for employer match	3.00%
Half Employer Match
Defined Contribution Plan Disclosure [Line Items]
Employers percent of matching contributions	50.00%
Percent of employees' gross pay for employer match	2.00%

Commitments (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2015
Leases, Operating [Abstract]
2016	$ 1,993
2017	1,127
2018	648
2019	444
2020	40
Thereafter	0
Total minimum payments required	$ 4,252

Commitments (Rent Expense) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Leases, Operating [Abstract]
Rentals	$ 2,591	$ 2,967	$ 3,053
Less: sublease rentals	(56)	(24)	(31)
Total rental expense	$ 2,535	$ 2,943	$ 3,022

Contingencies (Details) (Patent Infringement, USD $) In Millions, except Per Share data, unless otherwise specified	0 Months Ended
	Apr. 22, 2013
Loss Contingencies [Line Items]
Litigation settlement amount charge, net of tax	$ 1.0
Litigation settlement amount, negative impact on diluted earnings per share	$ 0.04
General and Administrative
Loss Contingencies [Line Items]
Litigation Settlement charge	$ 1.5

Quarterly Financial Data (Details) (USD $)

3 Months Ended

12 Months Ended

Sep. 30, 2015

Jun. 30, 2015

Mar. 31, 2015

Dec. 31, 2014

Sep. 30, 2014

Jun. 30, 2014

Mar. 31, 2014

Dec. 31, 2013

Sep. 30, 2015

Sep. 30, 2014

Sep. 30, 2013

Quarterly Financial Information Disclosure [Abstract]

Total revenue

$ 56,446,000

$ 54,538,000

$ 53,151,000

$ 48,723,000

$ 51,612,000

$ 47,885,000

$ 45,882,000

$ 47,322,000

$ 212,858,000

$ 192,701,000

$ 195,381,000

Gross profit

26,682,000

25,349,000

24,078,000

21,922,000

23,647,000

22,149,000

21,780,000

22,908,000

98,031,000

90,484,000

100,123,000

Net income (loss)

2,985,000

^[1],[2],[3]

2,496,000

^[1],[2],[3]

1,446,000

^[1],[2],[3]

(339,000)

^[1],[2],[3]

426,000

^[1]

(101,000)

^[1]

738,000

^[1]

688,000

^[1]

6,588,000

1,751,000

5,805,000

Net income per common share, basic (USD per share)

$ 0.12

$ 0.10

$ 0.06

$ (0.01)

$ 0.02

$ 0.00

$ 0.03

$ 0.27

$ 0.07

$ 0.22

Net income per common share, diluted (USD per share)

$ 0.12

$ 0.10

$ 0.06

$ (0.01)

$ 0.02

$ 0.00

$ 0.03

$ 0.26

$ 0.07

$ 0.22

Net tax benefits

Net tax benefits

400,000

500,000

100,000

1,100,000

200,000

900,000

1,400,000

800,000

Restructuring Charges [Abstract]

Restructuring charge

500,000

518,000

152,000

350,000

Restructuring accrual, net of tax

300,000

Gain From Settlement of Property and Casualty Claim [Abstract]

Gain from settlement of property and casualty claim

400,000

1,000,000

1,400,000

Gain from settlement of property and casualty claim, net of tax

$ 300,000

$ 600,000

[1]	During fiscal 2015 and 2014, we recorded net tax benefits of $0.9 million and $1.4 million, respectively. We recorded a benefit of $0.5 million in the first quarter of fiscal 2015 resulting from the reinstatement of the research and development tax credit for calendar year 2014, reversal of income tax reserves due to the expiration of the statute of limitations from various U.S. and foreign tax jurisdictions and reversal of tax reserves due to the resolution of tax audits. In the third quarter of fiscal 2015, we recorded a tax benefit of $0.4 million primarily due to the reversal of reserves for state research and development tax credits and transfer pricing, partially offset by an adjustment of the state rate on net deferred tax assets. We recorded net tax benefits of $0.2 million in the first quarter of fiscal 2014 resulting from the release of income tax reserves due to the expiration of the statute of limitations from various U.S. and foreign tax jurisdictions. During the second quarter of fiscal 2014, we recorded a tax benefit of $1.1 million resulting from re-measurement and reversal of certain income tax reserves as a result of the conclusion of a federal income tax audit for fiscal 2012. In the third quarter of fiscal 2014, we recorded a tax benefit of $0.1 million primarily for a valuation allowance reversal associated with the reassessment of state research and development tax credits.
[2]	In the second quarter of fiscal 2015, we recorded a business restructuring accrual of $0.5 million ($0.3 million after tax).
[3]	During fiscal 2015, we recorded a gain of $1.4 million from the settlement of a property and casualty insurance claim related to the replacement of our capital equipment destroyed in the fire at our subcontract manufacturer's location. We recorded $1.0 million ($0.6 million after tax) during the second quarter of fiscal 2015 and $0.4 million ($0.3 million after tax) during the third quarter of fiscal 2015.

Subsequent Event (Acquistion) (Details) (Bluenica Corporation, Subsequent Event, USD $) In Millions, unless otherwise specified	0 Months Ended
	Oct. 05, 2015
Subsequent Event [Line Items]
Cash consideration	$ 2.9
Business combination contingent liability payout period	4 years
Performance 1
Subsequent Event [Line Items]
Business Combination, Contingent Consideration, Liability	11.6
Performance 2
Subsequent Event [Line Items]
Business Combination, Contingent Consideration, Liability	$ 3.5

Subsequent Event (Disposition) (Details) (Etherios, Inc, Subsequent Event, USD $)	0 Months Ended
	Oct. 23, 2015	Oct. 23, 2017	Oct. 23, 2016	Oct. 23, 2015
Etherios, Inc \| Subsequent Event
Subsequent Event [Line Items]
Amount discontinued operation sold for				$ 9,000,000
Cash due at closing	4,000,000
Less: Employee related liabilities				(1,134,000)
Net cash proceeds at closing	2,866,000
Deferred payment		2,000,000	3,000,000
Total proceeds	$ 7,866,000

Subsequent Event (Restructuring)(Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended			0 Months Ended
	Mar. 31, 2015	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013	Nov. 19, 2015 Minimum Employee Severance 2016 Restructuring [Member] Subsequent Event	Nov. 19, 2015 Maximum Employee Severance 2016 Restructuring [Member] Subsequent Event
Subsequent Event [Line Items]
Restructuring Charges	$ 500	$ 518	$ 152	$ 350	$ 400	$ 600

- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

+ References+ Details

Schedule II - Valuation and Qualifying Accounts (Details) (USD $)
In Thousands, unless otherwise specified

12 Months Ended

Sep. 30, 2015

Sep. 30, 2014

Sep. 30, 2013

Valuation Allowance - Deferred Tax Assets

Valuation and Qualifying Accounts Disclosure [Line Items]

Balance at beginning of period

$ 572

$ 807

$ 887

Increase (Decrease) to costs and expenses

316

174

170

Deductions

409

250

Balance at end of period

862

572

807

Valuation Account - Doubtful Accounts

Valuation and Qualifying Accounts Disclosure [Line Items]

Balance at beginning of period

367

313

295

Increase (Decrease) to costs and expenses

202

209

309

Deductions

^[1]

155

^[1]

291

^[1]

Balance at end of period

483

367

313

Reserve for Future Returns and Pricing Adjustments

Valuation and Qualifying Accounts Disclosure [Line Items]

Balance at beginning of period

1,662

1,770

1,362

Increase (Decrease) to costs and expenses

7,002

6,526

6,973

Deductions

6,847

6,634

6,565

Balance at end of period

$ 1,817

$ 1,662

$ 1,770

[1]	Uncollectible accounts charged against allowance, net of recoveries

Summary of Significant Accounting Policies (Property, Equipment and Improvements, Net) (Details)	12 Months Ended
	Sep. 30, 2015
Furniture and Fixtures \| Minimum
Property, Plant and Equipment [Line Items]
Property, equipment and improvements depreciation life	3 years
Furniture and Fixtures \| Maximum
Property, Plant and Equipment [Line Items]
Property, equipment and improvements depreciation life	5 years
Building Improvements
Property, Plant and Equipment [Line Items]
Property, equipment and improvements depreciation life	10 years
Buildings
Property, Plant and Equipment [Line Items]
Property, equipment and improvements depreciation life	39 years

Summary of Significant Accounting Policies (Recent Accounting Developments) (Details) (Restatement Adjustment [Member], Accounting Standards Update 2013-11 [Member], USD $) In Millions, unless otherwise specified	3 Months Ended
	Dec. 31, 2014
Restatement Adjustment [Member] \| Accounting Standards Update 2013-11 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Unrecognized Tax Benefits, Period Increase (Decrease)	$ 0.4

Summary of Significant Accounting Policies (Warranty) (Details)	12 Months Ended
	Sep. 30, 2015
Accounting Policies [Abstract]
Warranty period, minimum	1 year
Warranty period, maximum	5 years

Share Rights Plan (Details) (Series A Junior Participating Preferred Stock, USD $)	Sep. 30, 2015
Series A Junior Participating Preferred Stock
Class of Warrant or Right [Line Items]
Amount of shares eligible to buy	0.01
Exercise price	$ 60