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Share-Based Compensation (Schedule Of Assumptions Used) (Details) - Stock Options [Member]
3 Months Ended
Nov. 30, 2018
Nov. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Weighted-average dividend yield 1.40% 1.30%
Weighted-average volatility 26.30% 34.00%
Risk-free interest rate 3.10% 2.20%
Weighted-average expected lives 6 years 7 years