Consolidated Statement of Shareholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Shares Issued [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comp Income (Loss) [Member]
Beginning balance at Sep. 30, 2015	$ 165,873		$ 117,151	$ 51,052	$ (2,330)
Beginning balance, Shares at Sep. 30, 2015		41,838
Cash dividends paid	(33,649)			(33,649)
Exercise of stock options	2,294		2,294
Exercise of stock options, Share		152
Conversion of restricted share units	0	$ 0	0	0	0
Conversion of restricted share units, Shares		117
Stock compensation expense	2,911		2,911
Net earnings	32,229			32,229
Foreign currency translation adjustment	(2,732)				(2,732)
Hedging activity, net of tax	(454)				(454)
Ending balance at Sep. 30, 2016	166,472		122,356	49,632	(5,516)
Ending balance, Shares at Sep. 30, 2016		42,107
Cash dividends paid	(24,266)			(24,266)
Exercise of stock options	(129)		(129)
Exercise of stock options, Share		18
Conversion of restricted share units	0	$ 0	0	0	0
Conversion of restricted share units, Shares		82
Stock compensation expense	3,381		3,381
Net earnings	21,557			21,557
Foreign currency translation adjustment	1,616				1,616
Hedging activity, net of tax	954				954
Ending balance at Sep. 30, 2017	169,585		125,608	46,923	(2,946)
Ending balance, Shares at Sep. 30, 2017		42,207
Cash dividends paid	(21,170)			(21,170)
Exercise of stock options	$ 183		183
Exercise of stock options, Share	12	13
Conversion of restricted share units	$ 0	$ 0	0	0	0
Conversion of restricted share units, Shares		180
Stock compensation expense	3,402		3,402
Net earnings	23,849			23,849
Foreign currency translation adjustment	(1,075)				(1,075)
Hedging activity, net of tax	644				644
Ending balance at Sep. 30, 2018	$ 175,418		$ 129,193	$ 49,602	$ (3,377)
Ending balance, Shares at Sep. 30, 2018		42,400