Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	May 31, 2020	May 31, 2019	May 31, 2020	May 31, 2019
Statement Of Income And Comprehensive Income [Abstract]
Net earnings	$ 10,094	$ 2,897	$ 23,955	$ 669
Other comprehensive (loss) income:
Defined benefit pension plan adjustment, net of tax	43	38	129	104
Foreign currency translation adjustment, net of hedging activities and tax	(2,642)	(1,831)	(3,831)	125
Unrealized gains on marketable securities, net of tax	59	0	121	0
Total other comprehensive (loss) income, net of tax expense of $297, $120, $670 and $421, respectively	(2,540)	(1,793)	(3,581)	229
Total comprehensive income	$ 7,554	$ 1,104	$ 20,374	$ 898