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, 2011	$ 275,343	$ 117	$ 34,343	$ 242,254	$ (1,371)
Balance, shares at Sep. 30, 2011		11,752
Net income	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	743		743
Shares withheld in lieu of employee tax withholding	(154)		(154)
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	42,076			42,076
Foreign currency translation adjustments	(1,719)				(1,719)
Stock-based compensation	2,369		2,369
Stock-based compensation, shares		39
Excess tax benefit from share-based compensation	464		464
Shares withheld in lieu of employee tax withholding	(187)		(187)
Amortization of restricted stock	135		2,095
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
Net income	29,224			29,224
Foreign currency translation adjustments	(4,447)				(4,447)
Stock-based compensation	3,385		3,385
Stock-based compensation, shares		44
Excess tax benefit from share-based compensation	407		407
Shares withheld in lieu of employee tax withholding	(718)		(718)
Issuance of restricted stock	1	1
Issuance of restricted stock, shares		16
Dividends paid	(11,998)			(11,998)
Postretirement benefit adjustment, net of tax	17				17
Balance at Sep. 30, 2014	$ 371,097	$ 120	$ 46,267	$ 331,213	$ (6,503)
Balance, shares at Sep. 30, 2014		12,031