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Stock-Based Compensation (Details 1) - USD ($)
$ in Thousands, shares in Millions
3 Months Ended 9 Months Ended
May 31, 2017
May 31, 2016
May 31, 2017
May 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Recognition of stock-based compensation expense and related charges $ 18,350 $ 13,445 $ 33,377 $ 58,505
Stock-based compensation expense, tax benefits 300 $ 100 700 $ 800
Reversal of stock-based compensation expense     $ 21,000  
Time-based restricted stock units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period     3 years  
Restricted stock units awarded     1.8 2.6
Performance-based restricted stock units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted stock units awarded     0.6 1.3
Performance-based restricted stock units | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period     3 years  
Performance-based restricted stock units | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period     5 years  
Performance-based restricted stock units | Maximum | Possibility One        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting percentage     100.00%  
Performance-based restricted stock units | Maximum | Possibility Two        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting percentage     150.00%  
Market Based Restricted Stock Units [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period     3 years  
Restricted stock units awarded     0.4 0.4
Market Based Restricted Stock Units [Member] | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting percentage     200.00%  
Restricted Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation related to share-based compensation costs $ 58,500   $ 58,500  
Unrecognized compensation related to share-based compensation costs, weighted average period of recognition     1 year 6 months