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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, 2012
May 31, 2011
May 31, 2012
May 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense before tax benefits $ 20,123,000 $ 20,053,000 $ 59,857,000 $ 59,854,000
Tax benefits related to the stock-based compensation expense 300,000 800,000 1,200,000 1,600,000
Restricted stock awards
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total unrecognized stock-based compensation expense related to restricted stock awards $ 79,200,000   $ 79,200,000  
Weighted-average period for recognition of stock-based compensation expense, in years     1 year 146 days  
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     2.1  
Performance Shares
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted stock units awarded     2.1  
Performance Shares | Maximum
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock as percentage of number of units granted at end of vesting period depending on performance     150.00%  
Performance Shares | Scenario 1
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period     3 years  
Performance Shares | Scenario 2
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period     4 years  
Performance Shares | Scenario 3
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period     5 years