Postretirement and Other Employee Benefits - Weighted-Average Actuarial Assumptions (Details)	12 Months Ended
	Aug. 31, 2023	Aug. 31, 2022	Aug. 31, 2021
Net periodic benefit cost:
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%
PBO:
Expected long-term return on plan assets	3.70%	3.60%	3.00%
Rate of compensation increase	1.90%	2.10%	2.20%
Discount rate	2.80%	2.60%	0.70%