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Intangible Assets And Goodwill (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Aug. 31, 2019
Aug. 31, 2018
Aug. 31, 2017
Intangible Assets And Goodwill [Abstract]      
Aggregate amortization expense from finite-lived intangible assets $ 5.0 $ 5.4 $ 3.5