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Basis Of Presentation And Summary Of Significant Accounting Policies (Goodwill) (Narrative) (Details) - USD ($)
3 Months Ended 12 Months Ended
Feb. 28, 2017
Aug. 31, 2017
Aug. 31, 2016
Aug. 31, 2015
Basis Of Presentation And Summary Of Significant Accounting Policies [Abstract]        
Impairment of goodwill $ 0 $ 0 $ 0 $ 0