Quarterly Results Of Operations (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended												12 Months Ended
	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014		Jun. 30, 2014		Mar. 31, 2014		Dec. 31, 2013		Sep. 30, 2015	Sep. 30, 2014		Sep. 30, 2013
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 162,325	$ 176,733	$ 170,199	$ 152,601	$ 162,847		$ 150,800		$ 162,295		$ 171,872		$ 661,858	$ 647,814		$ 640,867
Gross profit	29,947	32,944	24,301	21,069	25,746		29,642		34,928		35,158		108,261	125,474		138,492
Income from continuing operations					2,429		2,947		6,976		7,268		9,439	19,620		39,739
Net income	$ 6,312	$ 7,049	$ (3,683)	$ (239)	$ 2,429		$ 2,947		$ 15,593		$ 8,255		$ 9,439	$ 29,224		$ 42,076
Earnings per share ─ continuing operations
Basic					$ 0.20		$ 0.25		$ 0.58		$ 0.61		$ 0.80	$ 1.63		$ 3.32
Diluted					0.20		0.24		0.58		0.60		0.79	1.62		3.32
Earnings per share:
Basic	$ 0.54	$ 0.60	$ (0.31)	$ (0.02)	0.20	[1]	0.25	[1]	1.30	[1]	0.69	[1]	0.80	2.43	[1]	3.52
Diluted	$ 0.54	$ 0.60	$ (0.31)	$ (0.02)	$ 0.20	[1]	$ 0.24	[1]	$ 1.29	[1]	$ 0.68	[1]	$ 0.79	$ 2.42	[1]	$ 3.51

[1] The increase in earnings per share for the second quarter of Fiscal 2014 was primarily due to the sale of Transdyn. For additional information on this disposition, see Note N.