Pension and Other Postretirement Benefits - Schedule of Assumptions Used (Details)	12 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2022
Pension benefits
Weighted-average assumptions used to determine benefit obligations
Discount rate	5.50%	5.30%	4.80%
Weighted-average assumptions used to determine net periodic benefit costs
Expected return on plan assets	5.30%	5.00%	5.10%
Pension benefits | Service Cost
Weighted-average assumptions used to determine net periodic benefit costs
Discount rate	5.30%	4.80%	2.80%
Pension benefits | Interest Cost
Weighted-average assumptions used to determine net periodic benefit costs
Discount rate	5.40%	4.50%	2.10%
Postretirement benefits
Weighted-average assumptions used to determine benefit obligations
Discount rate	5.40%	5.30%	4.80%
Postretirement benefits | Service Cost
Weighted-average assumptions used to determine net periodic benefit costs
Discount rate	5.30%	4.80%	2.90%
Postretirement benefits | Interest Cost
Weighted-average assumptions used to determine net periodic benefit costs
Discount rate	5.40%	4.50%	2.20%