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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (UNAUDITED) - USD ($)
$ in Thousands
 3 Months Ended
Nov. 30, 2016
Nov. 30, 2015
Statement of Comprehensive Income [Abstract]    
Net earnings $ 6,275 $ 25,063
Other comprehensive income (loss), net of income taxes:    
Foreign currency translation adjustment (21,531) (21,995)
Net unrealized gain (loss) on derivatives:    
Unrealized holding gain (loss), net of income taxes of $10 and $(147) 132 (9)
Reclassification for gain included in net earnings, net of income taxes of $(47) and $(49) (190) (118)
Net unrealized loss on derivatives, net of income taxes of $(37) and $(196) (58) (127)
Defined benefit obligation:    
Amortization of prior services, net of income taxes of $(2) and $(1) (9) (1)
Defined benefit obligation, net of income taxes of $(2) and $(1) (9) (1)
Other comprehensive loss (21,598) (22,123)
Comprehensive income (loss) $ (15,323) $ 2,940