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, 2014	$ 329,258	$ 131	$ 70,704	$ 260,919	$ (2,496)
Beginning Balance, Shares at Sep. 30, 2014		13,147,416
Net loss	(32,641)			(32,641)
Other comprehensive income (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	$ 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 loss	$ (45,970)			(45,970)
Other comprehensive income (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	$ 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
Net loss	$ (56,791)			(56,791)
Other comprehensive income (loss)	1,711				1,711
Issuance of restricted stock		$ 1	(1)
Issuance of restricted stock, Shares		109,500
Forfeiture of restricted stock, Shares		(3,250)
Issuance of common stock pursuant to exercise of options, net of tax	$ 35		35
Issuance of common stock pursuant to exercise of options, Shares	4,000	4,000
Stock-based compensation	$ 5,732		5,732
Ending Balance at Sep. 30, 2017	$ 195,154	$ 134	$ 83,733	$ 125,517	$ (14,230)
Ending Balance, Shares at Sep. 30, 2017	13,438,316	13,438,316