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Postretirement and Other Employee Benefits (Weighted-Average Actuarial Assumptions) (Details)
12 Months Ended
Aug. 31, 2021
Aug. 31, 2020
Aug. 31, 2019
Net periodic benefit cost:      
Expected long-term return on plan assets 2.90% 3.00% 3.60%
Rate of compensation increase 2.10% 2.00% 4.40%
Discount rate 0.80% 0.50% 2.20%
PBO:      
Expected long-term return on plan assets 3.00% 2.90% 2.00%
Rate of compensation increase 2.20% 2.10% 4.30%
Discount rate 0.70% 0.80% 1.70%