Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Feb. 29, 2020	Feb. 28, 2019	Feb. 29, 2020	Feb. 28, 2019
Statement Of Income And Comprehensive Income [Abstract]
Net earnings (loss)	$ 5,516	$ (3,440)	$ 13,861	$ (2,228)
Other comprehensive (loss) income:
Defined benefit pension plan adjustment, net of tax	43	38	86	67
Foreign currency translation adjustment, net of hedging activities and tax	(895)	852	(1,188)	1,958
Unrealized gains on marketable securities, net of tax	61	0	61	0
Total other comprehensive income (loss), net of tax (benefit) expense of ($449), $75, ($373) and $301, respectively	(791)	890	(1,041)	2,025
Total comprehensive income (loss)	$ 4,725	$ (2,550)	$ 12,820	$ (203)