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Stock-Based Compensation - Additional Information (Detail) (USD $)
Share data in Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Feb. 28, 2013
Feb. 29, 2012
Feb. 28, 2013
Feb. 29, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Recognition of stock-based compensation expense $ 17,710,000 $ 21,069,000 $ 36,513,000 $ 39,734,000
Stock-based compensation expense, tax benefit 200,000 500,000 400,000 900,000
Restricted Stock
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation expense related to restricted stock awards $ 82,600,000   $ 82,600,000  
Unrecognized compensation expense related to restricted stock awards, weighted average period of recognition 1 year 6 months   1 year 6 months  
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     1.9  
Performance-based restricted stock units
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period     3 years  
Restricted stock units awarded     1.7  
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%