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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, 2014
May 31, 2013
May 31, 2014
May 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Recognition of stock-based compensation expense $ 14,561,000 $ 14,433,000 $ 6,627,000 $ 47,620,000
Reversal to stock-based compensation expense     38,400,000  
Stock-based compensation expense, tax (expense) benefit 300,000 (400,000) 700,000 100,000
After market services (AMS)
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Awards vesting 0.2      
Stock-based compensation expense     2,400,000  
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     1.9 2.0
Performance-based restricted stock units
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted stock units awarded     1.6 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 stock-based compensation expense related to restricted stock awards $ 56,100,000   $ 56,100,000  
Unrecognized stock-based compensation expense related to restricted stock awards, weighted average period of recognition     1 year 6 months