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Share-Based Compensation (Schedule of Assumptions Used to Estimate Fair Value of TSR Portion of Awards Granted) (Details)
12 Months Ended
Aug. 31, 2020
Aug. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expected term (years) 6 years 6 years
Risk-free interest rate 1.60% 3.10%
Volatility 28.40% 26.30%
Dividend yield 1.30% 1.40%
Performance Stock Units [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expected term (years) 3 years  
Risk-free interest rate 1.50%  
Volatility 29.50%  
Dividend yield 1.30%