Consolidated Statement of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss
Beginning Balance at Sep. 30, 2012	$ 214,987	$ 128	$ 60,633	$ 154,451	$ (225)
Beginning Balance, Shares at Sep. 30, 2012		12,802,160
Net income (loss)	69,557			69,557
Other comprehensive loss	(839)				(839)
Excess tax benefit from stock-based compensation	$ 3,390		3,390
Issuance of restricted stock, Shares	0
Issuance of common stock pursuant to exercise of options, net of tax	$ 1,419	$ 1	1,418
Issuance of common stock pursuant to exercise of options, Shares	139,906	139,906
Stock-based compensation expense	$ 544		544
Ending Balance at Sep. 30, 2013	289,058	$ 129	65,985	224,008	(1,064)
Ending Balance, Shares at Sep. 30, 2013		12,942,066
Net income (loss)	36,911			36,911
Other comprehensive loss	(1,432)				(1,432)
Excess tax benefit from stock-based compensation	$ 178		178
Issuance of restricted stock		$ 2	(2)
Issuance of restricted stock, Shares	197,000	197,000
Forfeiture of restricted stock, Shares		(8,000)
Issuance of common stock pursuant to exercise of options, net of tax	$ 424		424
Issuance of common stock pursuant to exercise of options, Shares	16,350	16,350
Stock-based compensation expense	$ 4,119		4,119
Ending Balance at Sep. 30, 2014	$ 329,258	$ 131	70,704	260,919	(2,496)
Ending Balance, Shares at Sep. 30, 2014	13,147,416	13,147,416
Net income (loss)	$ (32,641)			(32,641)
Other comprehensive loss	(10,449)				(10,449)
Excess tax expense from stock-based compensation	$ (1,083)		(1,083)
Issuance of restricted stock, Shares	3,000	3,000
Forfeiture of restricted stock, Shares		(2,500)
Stock-based compensation expense	$ 4,539		4,539
Ending Balance at Sep. 30, 2015	$ 289,624	$ 131	$ 74,160	$ 228,278	$ (12,945)
Ending Balance, Shares at Sep. 30, 2015	13,147,916	13,147,916