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, 2018		Jun. 30, 2018		Mar. 31, 2018		Dec. 31, 2017		Sep. 30, 2017		Jun. 30, 2017		Mar. 31, 2017		Dec. 31, 2016		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Accounting Policies [Abstract]
Income from continuing operations																	$ 1,303	$ 9,366	$ 13,478
Income from discontinued operations, after income taxes																	0	0	3,230
Net income	$ 3,608	[1],[2]	$ 2,621	[1],[2]	$ (357)	[1],[2]	$ (4,569)	[1],[2]	$ 4,343	[1],[2]	$ 1,335	[1],[2]	$ 1,331	[1],[2]	$ 2,357	[1],[2]	$ 1,303	$ 9,366	$ 16,708
Denominator for basic net income per common share — weighted average shares outstanding																	27,083,000	26,432,000	25,760,000
Effect of dilutive securities:
Stock options and restricted stock units																	569,000	667,000	551,000
Denominator for diluted net income per common share — adjusted weighted average shares																	27,652,000	27,099,000	26,311,000
Basic net income per common share:
Continuing operations																	$ 0.05	$ 0.35	$ 0.52
Discontinued operations																	0.00	0.00	0.13
Net income	$ 0.13		$ 0.10		$ (0.01)		$ (0.17)		$ 0.16		$ 0.05		$ 0.05		$ 0.09		0.05	0.35	0.65
Diluted net income per common share:
Continuing operations																	0.05	0.35	0.51
Discontinued operations																	0.00	0.00	0.12
Net (loss) income per common share, diluted (USD per share)	$ 0.13		$ 0.09		$ (0.01)		$ (0.17)		$ 0.16		$ 0.05		$ 0.05		$ 0.09		$ 0.05	$ 0.35	$ 0.64	[3]
Antidilutive securities excluded from computation of earnings per share																	925,063	1,142,322	1,519,691

[1] During fiscal 2018, we recorded net tax expenses of $1.5 million and in fiscal 2017, we recorded net tax benefits of $1.0 million, respectively. We recorded tax expense of $2.8 million in the first quarter of fiscal 2018, $0.2 million in the second quarter of fiscal 2018 and $0.1 million in the third quarter of fiscal 2018 resulting from new U.S. tax legislation that was enacted during the first quarter of fiscal 2018 and the adoption of ASU 2016-09 relating to the accounting for the tax effects of stock compensation. In the fourth quarter of fiscal 2018, we recorded a net tax benefit of $1.5 million for the release of a valuation allowance against U.S. federal capital loss carryforward due to expected capital gains tax in fiscal 2019 resulting from the sale of our corporate headquarters building in October 2018 (see Note 18 to the Consolidated Financial Statements) along with U.S., state and foreign prior year true-up provision to return.We recorded a benefit of $0.1 million in the first quarter of fiscal 2017 resulting from reversal of income tax reserves due to the 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 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.

[2] For continuing operations, we recorded business restructuring charges of $0.2 million ($0.1 million after tax) in the third quarter of fiscal 2018 and $0.1 million ($0.1 million after tax) in the fourth quarter of fiscal 2018. We also recorded business restructuring charges of $2.5 million ($1.6 million after tax) in the third quarter of fiscal 2017.

[3] Earnings per share presented are calculated by line item and may not add due to the use of rounded amounts.