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Accumulated Other Comprehensive Loss (Schedule Of Accumulated Other Comprehensive Loss ) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Aug. 31, 2017
Aug. 31, 2016
Aug. 31, 2015
Accumulated Other Comprehensive Loss [Abstract]      
Defined benefit pension plan, net of tax benefit of $1,451 and $1,648 $ (2,450) $ (2,781)  
Cash flow hedges, net of tax of $0 and $33 3,900 5,600 $ 5,400
Foreign currency translation, net of hedging activities, net of tax expense of $2,508 and $3,287 (9,658) (11,391)  
Total accumulated other comprehensive loss (12,108) (14,172) $ (15,308)
Defined benefit pension tax 1,451 1,648  
Foreign currency adjustment tax $ 2,508 $ 3,287