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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, 2019
Nov. 30, 2018
Stock Options [Member]    
Number of units granted 44,347 38,337
Weighted average grant-date fair value per award $ 24.18 $ 24.71
Restricted Stock Units [Member]    
Number of units granted 30,235 29,013
Weighted average grant-date fair value per award $ 90.73 $ 88.27
Performance Stock Units [Member]    
Number of units granted 22,715 20,631
Weighted average grant-date fair value per award $ 102.28 $ 107.80