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Stock-Based Compensation - Additional Information (Detail) (USD $)
Share data in Millions, unless otherwise specified
3 Months Ended 9 Months Ended
May 31, 2013
May 31, 2012
May 31, 2013
May 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Recognition of stock-based compensation expense $ 15,688,000 $ 20,123,000 $ 52,201,000 $ 59,857,000
Stock-based compensation expense, tax (expense) benefit (400,000) 300,000 100,000 1,200,000
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     2.0  
Performance-based restricted stock units
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted stock units awarded     1.7  
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 | Possibility One | Maximum
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting percentage     100.00%  
Performance-based restricted stock units | Possibility Two | Maximum
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting percentage     150.00%  
Restricted Stock
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation expense related to restricted stock awards $ 69,900,000   $ 69,900,000  
Unrecognized compensation expense related to restricted stock awards, weighted average period of recognition 1 year 7 months 6 days   1 year 7 months 6 days