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Share-Based Compensation (Schedule of Assumptions Used) (Details)
3 Months Ended
Nov. 30, 2019
Nov. 30, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]    
Weighted-average dividend yield 1.30% 1.40%
Weighted-average volatility 28.40% 26.30%
Risk-free interest rate 1.60% 3.10%
Weighted-average expected life 6 years 6 years