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Summary of Significant Accounting Policies (Net Income Per Common Share) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Accounting Policies [Abstract]                      
Income from continuing operations $ 4,343 [1],[2] $ 1,335 [1],[2] $ 1,331 [1],[2] $ 2,357 [1],[2] $ 3,844 [1],[2] $ 4,277 [1],[2] $ 2,226 [1],[2] $ 3,131 [1],[2] $ 9,366 $ 13,478 $ 9,433
Income (loss) from discontinued operations, after income taxes 0 0 0 0 0 0 (89) 3,319 0 3,230 (2,845)
Net income $ 4,343 [1],[2] $ 1,335 [1],[2] $ 1,331 [1],[2] $ 2,357 [1],[2] $ 3,844 [1],[2] $ 4,277 [1],[2] $ 2,137 [1],[2] $ 6,450 [1],[2] $ 9,366 $ 16,708 $ 6,588
Denominator for basic net income per common share — weighted average shares outstanding                 26,432,000 25,760,000 24,645,000
Effect of dilutive securities:                      
Stock options and restricted stock units                 667,000 551,000 582,000
Denominator for diluted net income per common share — adjusted weighted average shares                 27,099,000 26,311,000 25,227,000
Basic net income (loss) per common share:                      
Continuing operations $ 0.16 $ 0.05 $ 0.05 $ 0.09 $ 0.15 $ 0.17 $ 0.09 $ 0.12 $ 0.35 $ 0.52 $ 0.38
Discontinued operations 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.13 0.00 0.13 (0.12)
Net income (1) 0.16 0.05 0.05 0.09 0.15 0.17 0.08 0.25 0.35 0.65 0.27 [3]
Diluted net income (loss) per common share:                      
Continuing operations 0.16 0.05 0.05 0.09 0.14 0.16 0.09 0.12 0.35 0.51 0.37
Discontinued operations 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.13 0.00 0.12 (0.11)
Net income (1) $ 0.16 $ 0.05 $ 0.05 $ 0.09 $ 0.14 $ 0.16 $ 0.08 $ 0.25 $ 0.35 $ 0.64 [3] $ 0.26
Antidilutive securities excluded from computation of earnings per share                 1,142,322 1,519,691 3,016,911
[1] During fiscal 2017 and 2016, we recorded net tax benefits of $1.0 million and $1.5 million, respectively. We recorded a benefit of $0.1 million in the first quarter of fiscal 2017 resulting from the reversal of income tax reserves due to the 18. QUARTERLY FINANCIAL DATA (UNAUDITED)(CONTINUED)expiration of the statutes of limitation from various U.S. and foreign tax jurisdictions. In the third quarter of fiscal 2017, we recorded a tax benefit of $0.7 million from the reversal of income tax reserves due to the expiration of the statutes of limitation from various U.S. and foreign tax jurisdictions. In the fourth quarter of fiscal 2017, we recorded a net tax benefit of $0.2 million, primarily from the reversal of income tax reserves due to the expiration of the statutes of limitation from various U.S. and foreign tax jurisdictions and state and foreign prior year true-up provision to return. We recorded a benefit of $0.7 million in the first quarter of fiscal 2016 resulting from the reinstatement of the research and development tax credit for calendar year 2015, reversal of income tax reserves due to the expiration of the statutes of limitation 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 2016, we recorded a tax benefit of $0.5 million primarily due to the filing of an amended income tax return resulting in a domestic refund related to qualified manufacturing activities. In the fourth quarter of fiscal 2016, we recorded a net tax benefit of $0.2 million, primarily due to the filing of an additional amended income tax return resulting in an additional domestic refund related to qualified manufacturing activities, partially offset by an adjustment of the state rate on net deferred tax assets.
[2] For continuing operations, we recorded business restructuring charges of $2.5 million ($1.6 million after tax) in the third quarter of fiscal 2017, $0.7 million ($0.4 million after tax) in the first quarter of fiscal 2016 and $0.1 million ($0.1 million after tax) in the second quarter of fiscal 2016.
[3] Earnings per share presented are calculated by line item and may not add due to the use of rounded amounts.