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Condensed Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
May 31, 2019
May 31, 2018
May 31, 2019
May 31, 2018
Statement Of Income And Comprehensive Income [Abstract]        
Net earnings $ 2,897 $ 10,379 $ 669 $ 15,299
Other comprehensive income (loss):        
Defined benefit pension plan adjustment, net of tax 38 40 104 109
Foreign currency translation adjustment, net of hedging activities and tax (1,831) (3,705) 125 (2,925)
Total other comprehensive (loss) income, net of tax expense of $120, $347, $421 and $74, respectively (1,793) (3,665) 229 (2,816)
Total comprehensive income $ 1,104 $ 6,714 $ 898 $ 12,483