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, 2013	$ 289,058	$ 129	$ 65,985	$ 224,008	$ (1,064)
Beginning 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
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
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
Forfeiture of restricted stock, Shares		(2,500)
Issuance of common stock pursuant to exercise of options, Shares	0
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
Net income (loss)	$ (45,970)			(45,970)
Other comprehensive loss	(2,996)				(2,996)
Excess tax expense from stock-based compensation	$ (1,411)		(1,411)
Issuance of restricted stock		$ 2	(2)
Issuance of restricted stock, Shares		182,400
Forfeiture of restricted stock, Shares		(2,250)
Issuance of common stock pursuant to exercise of options, Shares	0
Stock-based compensation expense	$ 5,220		5,220
Ending Balance at Sep. 30, 2016	$ 244,467	$ 133	$ 77,967	$ 182,308	$ (15,941)
Ending Balance, Shares at Sep. 30, 2016	13,328,066	13,328,066