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Share-Based Compensation (Summary Of Type And Fair Value Of Share-Based Compensation Awards) (Details) - $ / shares
3 Months Ended
Nov. 30, 2016
Nov. 30, 2015
Stock Options [Member]    
Number of shares granted 47,223 39,999
Weighted average grant-date fair value $ 26.25 $ 27.88
Restricted Stock Units [Member]    
Number of shares granted 37,033 38,438
Weighted average grant-date fair value $ 74.80 $ 64.37
Performance Stock Units [Member]    
Number of shares granted 15,902 16,466
Weighted average grant-date fair value $ 74.80 $ 64.37