Consolidated Statements of Stockholders' Equity (USD $) In Thousands	Total	Other Comprehensive Income (Loss)	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income/(Loss)
Balance at Sep. 30, 2008	$ 206,874	$ 0	$ 114	$ 26,181	$ 180,244	$ 335
Balance, shares at Sep. 30, 2008			11,404
Net income (loss)	39,717	39,717			39,717
Foreign currency translation adjustments	(2,867)	(2,867)				(2,867)
Amortization of deferred compensation-ESOP	158			158
Exercise of stock options	514		1	513
Exercise of stock options, shares			31
Stock-based compensation	1,623			1,623
Stock-based compensation, shares			29
Income tax benefit from stock options exercised	291			291
Amortization of restricted stock	476			476
Issuance of restricted stock	159			159
Issuance of restricted stock, shares			16
Unrealized loss (gain) on cash flow hedges, net of tax of $164, $265 and $94 for the period 30th sep 2009,2010 and 2011 respectively	(304)	(304)				(304)
Postretirement benefit adjustment, net of tax of $67, $58 and $60 for the period 30th sep 2009, 2010 and 2011 respectively	120	120				120
Total comprehensive income (loss)	36,666	36,666			39,717	(3,051)
Balance at Sep. 30, 2009	246,761	0	115	29,401	219,961	(2,716)
Balance, shares at Sep. 30, 2009			11,480
Net income (loss)	25,008	25,008			25,008
Foreign currency translation adjustments	1,467	1,467				1,467
Exercise of stock options	1,700		1	1,699
Exercise of stock options, shares			109
Stock-based compensation	792		1	791
Stock-based compensation, shares			58
Income tax benefit from stock options exercised	878			878
Amortization of restricted stock	467			467
Issuance of restricted stock	333			333
Issuance of restricted stock, shares			30
Unrealized loss (gain) on cash flow hedges, net of tax of $164, $265 and $94 for the period 30th sep 2009,2010 and 2011 respectively	(206)	(206)				(206)
Postretirement benefit adjustment, net of tax of $67, $58 and $60 for the period 30th sep 2009, 2010 and 2011 respectively	103	103				103
Total comprehensive income (loss)	26,372	26,372			25,008	1,364
Balance at Sep. 30, 2010	277,303	0	117	33,569	244,969	(1,352)
Balance, shares at Sep. 30, 2010			11,677
Net income (loss)	(2,715)	(2,715)			(2,715)
Foreign currency translation adjustments	(19)	(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
Income tax benefit from stock options exercised	180			180
Amortization of restricted stock	280			280
Issuance of restricted stock	1,042			1,042
Issuance of restricted stock, shares			28
Unrealized loss (gain) on cash flow hedges, net of tax of $164, $265 and $94 for the period 30th sep 2009,2010 and 2011 respectively	111	111				111
Postretirement benefit adjustment, net of tax of $67, $58 and $60 for the period 30th sep 2009, 2010 and 2011 respectively	(111)	(111)				(111)
Total comprehensive income (loss)	(2,734)	(2,734)			(2,715)	(19)
Balance at Sep. 30, 2011	$ 275,343	$ 0	$ 117	$ 34,343	$ 242,254	$ (1,371)
Balance, shares at Sep. 30, 2011			11,752