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Stockholders' Equity (Employee Stock Purchase Plan, Additional Information) (Details) - shares
12 Months Ended
Aug. 31, 2018
Aug. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares available for issuance under share based compensation plan 12,837,158 12,228,936
the ESPP    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Maximum aggregate number of shares subject to awards 12,000,000  
Shares available for issuance under share based compensation plan 4,679,061  
Eligibility period for employees to participate in ESPP 90 days  
the ESPP | Employee stock purchase plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Maximum percentage of an employees salary that can be used to purchase shares under the ESPP 10.00%  
Percentage for fair market value fixed for pricing 85.00%