Condensed Consolidated Statement of Stockholders' Equity - 9 months ended Jun. 30, 2017 - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Income (Loss) on Derivatives	Accumulated Deficit
Beginning balance at Sep. 30, 2016	$ 145,590	$ 372	$ 294,295	$ (3,561)	$ (145,516)
Beginning balance (shares) at Sep. 30, 2016	37,214,758	37,214,758
Increase (Decrease) in Stockholders' Equity
Issuance of common stock under employee incentive plans, net of shares surrendered	$ (78)	$ 1	(79)
Issuance of common stock under employee incentive plans, net of shares surrendered (shares)		116,956
Stock-based compensation	6,596		6,596
Tax shortfall from stock-based compensation awards	(338)		(338)
Other comprehensive income, net of tax	3,055			3,055
Net income	17,019				17,019
Ending balance at Jun. 30, 2017	$ 171,844	$ 373	$ 300,474	$ (506)	$ (128,497)
Ending balance (shares) at Jun. 30, 2017	37,331,714	37,331,714