Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Aug. 31, 2020	Aug. 31, 2019	Aug. 31, 2018
Statement Of Income And Comprehensive Income [Abstract]
Net earnings	$ 38,629	$ 2,172	$ 20,277
Other comprehensive loss:
Defined benefit pension plan adjustment, net of tax	(310)	(192)	251
Foreign currency translation adjustment, net of hedging activities and tax	(501)	(1,042)	(6,231)
Unrealized gains on marketable securities, net of tax	86	0	0
Total other comprehensive loss, net of tax (benefit) expense of ($929), $467, and $267	(725)	(1,234)	(5,980)
Total comprehensive income	$ 37,904	$ 938	$ 14,297