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Stock-Based Compensation (Narrative) (Details) (USD $)
Share data in Millions, unless otherwise specified
3 Months Ended
Nov. 30, 2011
Nov. 30, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation expense and related charges $ 18,665,000 $ 19,500,000
Tax effects related to the stock-based compensation expense 400,000 500,000
Restricted Stock Awards [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total unrecognized stock-based compensation expense related to restricted stock awards $ 114,300,000  
Weighted average period for recognition of stock-based compensation expense, in years 1.5  
Time-Based Restricted Stock Units [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Restricted stock units awarded 1.9  
Award vesting period, years three  
Performance-Based Restricted Stock Units [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Restricted stock units awarded 2.1  
Award vesting period, years three  
Maximum [Member] | Performance-Based Restricted Stock Units [Member]
   
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%  
Minimum [Member] | Performance-Based Restricted Stock Units [Member]
   
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 0.00%