Condensed Consolidated Statements of Shareholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Shares [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Beginning balance at Sep. 30, 2020	$ 247,629		$ 140,195	$ 0	$ 109,294	$ (1,860)
Beginning balance, Shares at Sep. 30, 2020		43,069		0
Conversion of restricted share units and exercise of stock options	2,852		2,852
Conversion of restricted share units and exercise of stock options, Shares		260
Stock compensation expense	2,291		2,291
Net earnings	53,081				53,081
Foreign currency translation adjustment	3,380					3,380
Hedging activity, net of tax	240					240
Ending balance at Mar. 31, 2021	309,473		145,338	$ 0	162,375	1,760
Ending balance, Shares at Mar. 31, 2021		43,329		0
Beginning balance at Dec. 31, 2020	278,867		141,395	$ 0	136,073	1,399
Beginning balance, Shares at Dec. 31, 2020		43,124		0
Conversion of restricted share units and exercise of stock options	2,893		2,893
Conversion of restricted share units and exercise of stock options, Shares		205
Stock compensation expense	1,050		1,050
Net earnings	26,302				26,302
Foreign currency translation adjustment	79					79
Hedging activity, net of tax	282					282
Ending balance at Mar. 31, 2021	309,473		145,338	$ 0	162,375	1,760
Ending balance, Shares at Mar. 31, 2021		43,329		0
Beginning balance at Sep. 30, 2021	328,302		147,403	$ 0	180,701	198
Beginning balance, Shares at Sep. 30, 2021		43,362		0
Conversion of restricted share units and exercise of stock options	(66)		193	$ (259)
Conversion of restricted share units and exercise of stock options, Shares		208		(10)
Stock compensation expense	3,389		3,389
Net earnings	44,092				44,092
Foreign currency translation adjustment	(1,878)					(1,878)
Hedging activity, net of tax	793					793
Ending balance at Mar. 31, 2022	374,632		150,985	$ (259)	224,793	(887)
Ending balance, Shares at Mar. 31, 2022		43,570		(10)
Beginning balance at Dec. 31, 2021	345,219		148,623	$ 0	196,041	555
Beginning balance, Shares at Dec. 31, 2021		43,514		0
Conversion of restricted share units and exercise of stock options	617		876	$ (259)
Conversion of restricted share units and exercise of stock options, Shares		56		(10)
Stock compensation expense	1,486		1,486
Net earnings	28,752				28,752
Foreign currency translation adjustment	(1,820)					(1,820)
Hedging activity, net of tax	378					378
Ending balance at Mar. 31, 2022	$ 374,632		$ 150,985	$ (259)	$ 224,793	$ (887)
Ending balance, Shares at Mar. 31, 2022		43,570		(10)