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Postretirement and Other Employee Benefits - Weighted-Average Actuarial Assumptions (Details)
12 Months Ended
Aug. 31, 2022
Aug. 31, 2021
Aug. 31, 2020
Net periodic benefit cost:      
Expected long-term return on plan assets 3.00% 2.90% 3.00%
Rate of compensation increase 2.20% 2.10% 2.00%
Discount rate 0.70% 0.80% 0.50%
PBO:      
Expected long-term return on plan assets 3.60% 3.00% 2.90%
Rate of compensation increase 2.10% 2.20% 2.10%
Discount rate 2.60% 0.70% 0.80%