Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Feb. 28, 2021	Feb. 29, 2020	Feb. 28, 2021	Feb. 29, 2020
Statement Of Income And Comprehensive Income [Abstract]
Net earnings	$ 11,876	$ 5,516	$ 18,971	$ 13,861
Other comprehensive income (loss):
Defined benefit pension plan adjustment, net of tax	59	43	102	86
Foreign currency translation adjustment, net of hedging activities and tax	481	(895)	1,864	(1,188)
Unrealized gain (loss) on marketable securities, net of tax	(25)	61	(56)	61
Total other comprehensive income (loss), net of tax expense (benefit) of $20, ($449), ($12), and ($373), respectively	515	(791)	1,910	(1,041)
Total comprehensive income	$ 12,391	$ 4,725	$ 20,881	$ 12,820