Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended						9 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Jun. 30, 2019	Jun. 30, 2018
Numerator:
Income from continuing operations, net of tax	$ 893			$ 4,979			$ 2,153	$ 7,741
Income (loss) from discontinued operations, net of tax	1,154			(8)			(8,113)	6,517
Net income (loss)	$ 2,047	$ (5,635)	$ (2,372)	$ 4,971	$ 2,835	$ 6,452	$ (5,960)	$ 14,258
Denominator:
Weighted-average shares used to compute basic EPS (in shares)	14,245			14,925			14,231	14,867
Common stock equivalents (in shares)	71			166			36	314
Weighted-average shares used to compute diluted EPS (in shares)	14,316			15,091			14,267	15,181
Basic income per share from continuing operations (USD per share)	$ 0.06			$ 0.33			$ 0.15	$ 0.52
Basic (loss) income per share from discontinued operations (USD per share)	0.08			0.00			(0.57)	0.44
Net (loss) income per basic share (USD per share)	0.14			0.33			(0.42)	0.96
Diluted income per share from continuing operations (USD per share)	0.06			0.33			0.15	0.51
Diluted (loss) income per share from discontinued operations (USD per share)	0.08			0.00			(0.57)	0.43
Net income (loss) per diluted share (USD per share)	$ 0.14			$ 0.33			$ (0.42)	$ 0.94
Stock Options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	819			679			1,062	428