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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, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2011
Accounting Policies [Abstract]                      
Net income $ 2,047 [1],[2],[3],[4] $ 1,528 [1],[2],[3],[4] $ 1,000 [1],[2],[3],[4] $ 1,230 [1],[2],[3],[4] $ 2,462 [1],[2] $ 2,307 [1],[2] $ 2,122 [1],[2] $ 724 [1],[2] $ 5,805 $ 7,615 $ 11,019
Denominator for basic net income per common share — weighted average shares outstanding                 25,956,000 25,743,000 25,312,000
Effect of dilutive securities [Abstract]                      
Stock options and restricted stock units                 281,000 403,000 507,000
Denominator for diluted net income per common share — adjusted weighted average shares                 26,237,000 26,146,000 25,819,000
Net income per common share, basic (USD per share) $ 0.08 $ 0.06 $ 0.04 $ 0.05 $ 0.10 $ 0.09 $ 0.08 $ 0.03 $ 0.22 $ 0.30 $ 0.44
Net income per common share, diluted (USD per share) $ 0.08 $ 0.06 $ 0.04 $ 0.05 $ 0.09 $ 0.09 $ 0.08 $ 0.03 $ 0.22 $ 0.29 $ 0.43
Antidilutive securities excluded from computation of earnings per share                 3,939,541 2,023,213 1,831,713
[1] During fiscal 2013, we recorded a business restructuring accrual of $0.4 million ($0.2 million after tax) in the fourth quarter of fiscal 2013. 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.
[2] During fiscal 2013 and 2012, we recorded discrete tax benefits of $0.8 million and $1.5 million, respectively. We recorded a benefit of $0.1 million in the first quarter of fiscal 2013 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 2013, we recorded a discrete tax benefit of $0.4 million resulting from the enactment of legislation on January 2, 2013 extending the research and development credit for the last three quarters of fiscal 2012. In the third quarter of fiscal 2013, we recorded a benefit of $0.1 million for the release of income tax reserves due to the expiration of the statute of limitations for U.S. Federal income tax for fiscal 2009. In the fourth quarter of fiscal 2013, we recorded $0.2 million for the reversal of tax reserves resulting from expiration of the statute of limitations for state income taxes. 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 statute 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 statute of limitations for state income taxes and a reduction in a foreign statutory rate.
[3] During the second quarter of fiscal 2013, we recorded a charge of $1.5 million ($1.0 million after tax) for the settlement of a patent infringement lawsuit.
[4] During the fourth quarter of fiscal 2013, we recorded a charge of $0.4 million ($0.2 million after tax) for impairment of certain intangibles.