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Stockholders' Equity (Equity Compensation Plan, Additional Information) (Details) - shares
Aug. 31, 2020
Aug. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Maximum aggregate number of shares subject to awards (in shares) 10,609,508 12,040,581
The 2011 Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Maximum aggregate number of shares subject to awards (in shares) 23,300,000