CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Income/(Loss)
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
Retirement of stock	(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
Net income	9,439			9,439
Foreign currency translation adjustments	(16,104)					(16,104)
Stock-based compensation	3,171		3,171
Stock-based compensation, shares		53
Excess tax benefit from share-based compensation	(191)		(191)
Shares withheld in lieu of employee tax withholding	(740)		(740)
Issuance of restricted stock	1	$ 1
Issuance of restricted stock, shares		16
Purchase of treasury value	(21,259)				$ (21,259)
Purchase of treasury shares					(670)
Dividends paid	(12,358)			(12,358)
Postretirement benefit adjustment, net of tax	206					206
Balance at Sep. 30, 2015	333,262	$ 121	48,507	328,294	$ (21,259)	(22,401)
Balance, shares at Sep. 30, 2015		12,100			(670)
Net income	15,510			15,510
Foreign currency translation adjustments	(928)					(928)
Stock-based compensation	4,883		4,883
Stock-based compensation, shares		81
Excess tax benefit from share-based compensation	(387)		(387)
Shares withheld in lieu of employee tax withholding	(1,000)		(1,000)
Issuance of restricted stock	1	$ 1
Issuance of restricted stock, shares		18
Purchase of treasury value	(3,740)				$ (3,740)
Purchase of treasury shares					(136)
Dividends paid	(11,845)			(11,845)
Postretirement benefit adjustment, net of tax	(439)					(439)
Balance at Sep. 30, 2016	$ 335,317	$ 122	$ 52,003	$ 331,959	$ (24,999)	$ (23,768)
Balance, shares at Sep. 30, 2016		12,199			(806)