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Quarterly Financial Data (Details) (USD $)
 3 Months Ended 12 Months Ended
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2010
Quarterly Financial Information Disclosure [Abstract]                      
Net sales $ 47,248,000 $ 47,632,000 $ 49,016,000 $ 46,662,000 $ 51,836,000 $ 54,274,000 $ 49,716,000 $ 48,334,000 $ 190,558,000 $ 204,160,000 $ 182,548,000
Gross profit 24,820,000 25,304,000 25,783,000 24,430,000 27,516,000 28,755,000 25,651,000 24,666,000 100,337,000 106,588,000 92,209,000
Net income 2,462,000 [1],[2] 2,307,000 [1],[2] 2,122,000 [1],[2] 724,000 [1],[2] 2,849,000 [1],[2] 3,615,000 [1],[2] 2,239,000 [1],[2] 2,316,000 [1],[2] 7,615,000 11,019,000 8,941,000
Net income per common share, basic $ 0.10 $ 0.09 $ 0.08 $ 0.03 $ 0.11 $ 0.14 $ 0.09 $ 0.09 $ 0.30 $ 0.44 $ 0.36
Net income per common share, diluted $ 0.09 $ 0.09 $ 0.08 $ 0.03 $ 0.11 $ 0.14 $ 0.09 $ 0.09 $ 0.29 $ 0.43 $ 0.36
Income Tax [Abstract]                      
Discrete income tax expense (benefit)                 (1,500,000) (700,000)  
Tax benefit for additional research and development tax credits   1,100,000                  
Expiration of statute of limitations 300,000     100,000 100,000     600,000 319,000 628,000 372,000
Restructuring Charges [Abstract]                      
Restructuring accrual (charge)   1,000,000 100,000 236,000 (200,000)     (100,000) (1,259,000) (154,000) 468,000
Restructuring accrual (charge), net of tax   $ 600,000 $ 0 $ 200,000 $ (100,000)     $ 0      
[1] During fiscal 2012, we recorded a business restructuring accrual of $0.2 million ($0.2 million after tax) in the first quarter, $0.1 million ($0.0 million after tax) in the second quarter and $1.0 million ($0.6 million after tax) in the third quarter. We reversed a business restructuring accrual of $0.1 million ($0.0 million after tax) in the first quarter of fiscal 2011 and recorded a restructuring charge of $0.2 million ($0.1 million after tax) during the fourth quarter of fiscal 2011.
[2] During fiscal 2012 and 2011, we recorded discrete tax benefits of $1.5 million and $0.7 million, respectively. We recorded a benefit of $0.1 million in the first quarter of fiscal 2012 resulting from the release of income tax reserves due to the expiration of the statutes of limitations from various U.S. tax jurisdictions. During the third quarter of fiscal 2012, we recorded $1.1 million for additional research and development tax credits identified for fiscal years ended September 30, 2009, 2010 and 2011 from a recently completed research and development tax credit study. During the fourth quarter of fiscal 2012, we recorded $0.3 million relating to expiration of statue of limitations. During fiscal 2011, we recorded $0.6 million in the first quarter and $0.1 million in the fourth quarter resulting from the reversal of previously established income tax reserves from various jurisdictions, primarily foreign, for the expiration of statute of limitations and from the enactment of the Tax Relief, Unemployment Insurance Reauthorization, and Job Creation Act of 2010 providing for the extension of the research and development tax credit.