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Share-Based Compensation (Summary Of Type And Fair Value Of Share-Based Compensation Awards) (Details) (USD $)
3 Months Ended
Nov. 30, 2013
Nov. 30, 2012
Stock Options [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number granted 25,394 24,684
Grant-date fair value per award $ 40.42 $ 40.09
Restricted Stock Units (RSUs) [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number granted 29,619 25,279
Grant-date fair value per award $ 74.84 $ 74.31
Performance Stock Units (PSUs) [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number granted 13,434 13,072
Grant-date fair value per award $ 74.84 $ 74.31