Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Aug. 31, 2021	Aug. 31, 2020	Aug. 31, 2019
Statement Of Income And Comprehensive Income [Abstract]
Net earnings	$ 42,572	$ 38,629	$ 2,172
Other comprehensive income (loss):
Defined benefit pension plan adjustment, net of tax	385	(310)	(192)
Foreign currency translation adjustment, net of hedging activities and tax	2,345	(501)	(1,042)
Unrealized (loss) gain on marketable securities, net of tax	(91)	86	0
Total other comprehensive income (loss), net of tax expense (benefit) of $409, ($929), and $467	2,639	(725)	(1,234)
Total comprehensive income	$ 45,211	$ 37,904	$ 938