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Stock-Based Compensation (Details 1) - USD ($)
$ in Thousands, shares in Millions
3 Months Ended
Nov. 30, 2016
Nov. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Recognition of stock-based compensation expense and related charges $ (291) $ 24,792
Stock-based compensation expense, tax benefits 100 $ 300
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 1.0 2.5
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 $ 74,600  
Unrecognized compensation related to share-based compensation costs, weighted average period of recognition 1 year 6 months