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Basis Of Presentation And Summary Of Significant Accounting Policies (Long-lived Assets) (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Aug. 31, 2017
Aug. 31, 2016
Aug. 31, 2015
Basis Of Presentation And Summary Of Significant Accounting Policies [Abstract]      
Impairment of long-lived assets $ 0.0 $ 0.0 $ 0.0