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Basis Of Presentation And Summary Of Significant Accounting Policies (Advertising and Sales Promotion Expenses) (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Aug. 31, 2020
Aug. 31, 2019
Aug. 31, 2018
Basis Of Presentation And Summary Of Significant Accounting Policies [Abstract]      
Advertising and sales promotion $ 21,606 $ 23,306 $ 22,314