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Condensed Consolidated Statements Of Comprehensive Income (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Feb. 28, 2017
Feb. 29, 2016
Feb. 28, 2017
Feb. 29, 2016
Condensed Consolidated Statements Of Comprehensive Income [Abstract]        
Other comprehensive loss, tax expense $ 87 $ (253) $ 653 $ 391