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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, 2018
Nov. 30, 2017
Stock Options [Member]    
Number of units granted 38,337 44,312
Weighted average grant-date fair value per award $ 24.71 $ 30.73
Restricted Stock Units [Member]    
Number of units granted 29,013 69,198
Weighted average grant-date fair value per award $ 88.27 $ 87.06
Performance Stock Units [Member]    
Number of units granted 20,631 14,854
Weighted average grant-date fair value per award $ 88.27 $ 88.06