Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Income/(Loss)
Balance (in shares) at Sep. 30, 2019		12,373			(806)
Balance at Sep. 30, 2019	$ 299,153	$ 124	$ 59,153	$ 289,422	$ (24,999)	$ (24,547)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	2,775			2,775
Foreign currency translation adjustments	2,387					2,387
Stock-based compensation (in shares)		30
Stock-based compensation	982		982
Shares withheld in lieu of employee tax withholding	(611)		(611)
Dividends paid	(3,013)			(3,013)
Balance (in shares) at Dec. 31, 2019		12,403			(806)
Balance at Dec. 31, 2019	301,673	$ 124	59,524	289,184	$ (24,999)	(22,160)
Balance (in shares) at Sep. 30, 2019		12,373			(806)
Balance at Sep. 30, 2019	299,153	$ 124	59,153	289,422	$ (24,999)	(24,547)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	10,196
Foreign currency translation adjustments	(4,529)
Balance (in shares) at Mar. 31, 2020		12,420			(806)
Balance at Mar. 31, 2020	300,131	$ 124	60,492	293,590	$ (24,999)	(29,076)
Balance (in shares) at Dec. 31, 2019		12,403			(806)
Balance at Dec. 31, 2019	301,673	$ 124	59,524	289,184	$ (24,999)	(22,160)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	7,421			7,421
Foreign currency translation adjustments	(6,916)					(6,916)
Stock-based compensation (in shares)		17
Stock-based compensation	968		968
Dividends paid	(3,015)			(3,015)
Balance (in shares) at Mar. 31, 2020		12,420			(806)
Balance at Mar. 31, 2020	300,131	$ 124	60,492	293,590	$ (24,999)	(29,076)
Balance (in shares) at Sep. 30, 2020		12,422			(806)
Balance at Sep. 30, 2020	306,626	$ 124	61,998	294,016	$ (24,999)	(24,513)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	(364)			(364)
Foreign currency translation adjustments	4,349					4,349
Stock-based compensation (in shares)		59
Stock-based compensation	894	$ 1	893
Shares withheld in lieu of employee tax withholding	(632)		(632)
Dividends paid	(3,028)			(3,028)
Balance (in shares) at Dec. 31, 2020		12,481			(806)
Balance at Dec. 31, 2020	307,845	$ 125	62,259	290,624	$ (24,999)	(20,164)
Balance (in shares) at Sep. 30, 2020		12,422			(806)
Balance at Sep. 30, 2020	306,626	$ 124	61,998	294,016	$ (24,999)	(24,513)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	(589)
Foreign currency translation adjustments	5,243
Balance (in shares) at Mar. 31, 2021		12,498			(806)
Balance at Mar. 31, 2021	306,332	$ 125	63,112	287,364	$ (24,999)	(19,270)
Balance (in shares) at Dec. 31, 2020		12,481			(806)
Balance at Dec. 31, 2020	307,845	$ 125	62,259	290,624	$ (24,999)	(20,164)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	(225)			(225)
Foreign currency translation adjustments	894					894
Stock-based compensation (in shares)		17
Stock-based compensation	853		853
Dividends paid	(3,035)			(3,035)
Balance (in shares) at Mar. 31, 2021		12,498			(806)
Balance at Mar. 31, 2021	$ 306,332	$ 125	$ 63,112	$ 287,364	$ (24,999)	$ (19,270)