Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands		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	3,356
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)
Employee stock purchase issuances		1,008		$ 1,030	(22)
Repurchase of common stock (in shares)				1,481
Repurchase of common stock		(14,058)		$ (14,058)
Issuance of stock upon exercise of stock options (in shares)			280
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
Acquisition of Etherios, Inc.		6,741	$ 7		6,734
Stock-based compensation expense		3,773			3,773
Ending balance (in shares) at Sep. 30, 2013			30,264	4,709
Ending balance at Sep. 30, 2013		274,243	$ 303	$ (38,517)	211,982	116,065	(15,590)
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)
Employee stock purchase issuances		1,009		$ 1,082	(73)
Repurchase of common stock (in shares)				1,734
Repurchase of common stock		(15,802)		$ (15,802)
Issuance of stock under stock award plans (in shares)			440
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 (in shares) at Sep. 30, 2014			30,704	6,314
Ending balance at Sep. 30, 2014		265,298	$ 307	$ (53,237)	218,689	117,816	(18,277)
Beginning balance at Jun. 30, 2014		273,010
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	[1]	426
Ending balance (in shares) at Sep. 30, 2014			30,704	6,314
Ending balance at Sep. 30, 2014		265,298	$ 307	$ (53,237)	218,689	117,816	(18,277)
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)
Employee stock purchase issuances		925		$ 1,041	(116)
Repurchase of common stock (in shares)				297
Repurchase of common stock		(2,339)		$ (2,339)
Issuance of stock under stock award plans (in shares)			830
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 (in shares) at Sep. 30, 2015			31,534	6,487
Ending balance at Sep. 30, 2015		274,938	$ 315	$ (54,535)	227,367	124,404	(22,613)
Beginning balance at Jun. 30, 2015		270,643
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	[1],[2],[3]	2,985
Ending balance (in shares) at Sep. 30, 2015			31,534	6,487
Ending balance at Sep. 30, 2015		$ 274,938	$ 315	$ (54,535)	$ 227,367	$ 124,404	$ (22,613)

[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] 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.

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