Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Feb. 28, 2019	Feb. 28, 2018	Feb. 28, 2019	Feb. 28, 2018
Statement Of Income And Comprehensive Income [Abstract]
Net earnings (loss)	$ (3,440)	$ 1,735	$ (2,228)	$ 4,920
Other comprehensive income (loss):
Defined benefit pension plan adjustment, net of tax	38	37	67	69
Foreign currency translation adjustment, net of hedging activities and tax	852	1,814	1,958	780
Total other comprehensive (loss) income, net of tax expense (benefit) of $75, ($306), $301 and ($274), respectively	890	1,851	2,025	849
Total comprehensive income (loss)	$ (2,550)	$ 3,586	$ (203)	$ 5,769