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Intangible Assets And Goodwill (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Aug. 31, 2017
Aug. 31, 2016
Aug. 31, 2015
Acquired License Rights For Intellectual Property [Abstract]      
Aggregate amortization expense from definite-lived intangible assets $ 3.5 $ 3.3 $ 3.7