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Share-Based Compensation (Details) (USD $)
3 Months Ended
Nov. 30, 2011
years
Nov. 30, 2010
Allocated Share-based Compensation Expense $ 900,000 $ 900,000
Grant date price $ 58.10  
Stock options exercise price $ 58.10  
Stock option vesting period 4  
Actual earned range minimum 0.00%  
Actual earned range maximum 2.00%  
Performance Stock [Member]
   
Stocks granted 19,386  
Stocks granted vested period three  
Restricted Stock Units [Member]
   
Stocks granted 33,989  
Stocks granted vested period three  
Approximate percent vested 33.00%  
Stock Options [Member]
   
Stocks granted 36,294