Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - 3 months ended Dec. 31, 2018 - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Treasury Stock	Acummulated Other Comprehensive Income
Balance at Sep. 30, 2018	$ 301,644	$ 123	$ 56,769	$ 291,530	$ (24,999)	$ (21,779)
Balance, shares at Sep. 30, 2018		12,281			(806)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(2,695)			(2,695)
Foreign currency translation adjustments	(4,088)					(4,088)
Stock-based compensation	1,220		1,220
Stock-based compensation, shares		41
Shares withheld in lieu of employee tax withholding	(731)		(731)
Dividends paid	(2,992)			(2,992)
Balance at Dec. 31, 2018	$ 292,358	$ 123	$ 57,258	$ 285,843	$ (24,999)	$ (25,867)
Balance, shares at Dec. 31, 2018		12,322			(806)