CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $) In Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income/(Loss)
Balance at Sep. 30, 2010	$ 277,303	$ 117	$ 33,569	$ 244,969	$ (1,352)
Balance, shares at Sep. 30, 2010		11,677
Net income (loss)	(2,715)			(2,715)
Foreign currency translation adjustments	(19)				(19)
Exercise of stock options	495		495
Exercise of stock options, shares		27
Stock-based compensation	(1,223)		(1,223)
Stock-based compensation, shares		20
Excess tax benefit from share-based compensation	180		180
Amortization of restricted stock	280		280
Issuance of restricted stock	1,042		1,042
Issuance of restricted stock, shares		28
Unrealized gain on cash flow hedges, net of tax	111				111
Postretirement benefit adjustment, net of tax	(111)				(111)
Balance at Sep. 30, 2011	275,343	117	34,343	242,254	(1,371)
Balance, shares at Sep. 30, 2011		11,752
Net income (loss)	29,657			29,657
Foreign currency translation adjustments	833				833
Exercise of stock options	1,799	1	1,798
Exercise of stock options, shares		98
Stock-based compensation	1,004		1,004
Stock-based compensation, shares		7
Excess tax benefit from share-based compensation	589		589
Amortization of restricted stock	135		135
Issuance of restricted stock	584	1	583
Issuance of restricted stock, shares		74
Retirement of stock, shares		(15)
Postretirement benefit adjustment, net of tax	159				159
Balance at Sep. 30, 2012	310,103	119	38,452	271,911	(379)
Balance, shares at Sep. 30, 2012		11,916
Net income (loss)	42,076			42,076
Foreign currency translation adjustments	(1,719)				(1,719)
Exercise of stock options, shares
Stock-based compensation	2,369		2,369
Stock-based compensation, shares		39
Excess tax benefit from share-based compensation	277		277
Amortization of restricted stock	2,095		2,095
Issuance of restricted stock
Issuance of restricted stock, shares		17
Retirement of stock, shares		(1)
Postretirement benefit adjustment, net of tax	25				25
Balance at Sep. 30, 2013	$ 355,226	$ 119	$ 43,193	$ 313,987	$ (2,073)
Balance, shares at Sep. 30, 2013		11,971