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Stock-Based Compensation (Details 1) - USD ($)
$ in Thousands, shares in Millions
3 Months Ended 6 Months Ended
Feb. 28, 2017
Feb. 29, 2016
Feb. 28, 2017
Feb. 29, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Recognition of stock-based compensation expense and related charges $ 15,318 $ 20,268 $ 15,027 $ 45,060
Stock-based compensation expense, tax benefits 200 $ 300 300 $ 600
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 $ 76,100   $ 76,100  
Unrecognized compensation related to share-based compensation costs, weighted average period of recognition     1 year 6 months