Earnings Per Share (Computation of Basic and Diluted Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Numerator:
Income from continuing operations									$ 15,510	$ 9,439	$ 19,620
Income from discontinued operations											9,604
Net income	$ 5,508	$ 4,894	$ 5,567	$ (459)	$ 6,312	$ 7,049	$ (3,683)	$ (239)	$ 15,510	$ 9,439	$ 29,224
Denominator:
Weighted average basic shares									11,400	11,869	12,003
Dilutive effect of restricted stock units									31	39	55
Weighted average diluted shares with assumed conversions									11,431	11,908	12,058
Net earnings per share:
Continuing operations									$ 1.36	$ 0.80	$ 1.63
Discontinued operations											0.80
Basic earnings per share	$ 0.48	$ 0.43	$ 0.49	$ (0.04)	$ 0.54	$ 0.60	$ (0.31)	$ (0.02)	1.36	0.80	2.43
Continuing operations									1.36	0.79	1.62
Discontinued operations											0.80
Diluted earnings per share	$ 0.48	$ 0.43	$ 0.49	$ (0.04)	$ 0.54	$ 0.60	$ (0.31)	$ (0.02)	$ 1.36	$ 0.79	$ 2.42