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Pension and Other Postretirement Benefits - Schedule of Assumptions Used (Details) | 12 Months Ended
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Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2020
Pension benefits |  |  |
Weighted-average assumptions used to determine benefit obligations |  |  |
Discount rate | 4.80% | 2.70% | 2.80%
Weighted-average assumptions used to determine net periodic benefit costs |  |  |
Expected return on plan assets | 5.10% | 6.50% | 7.00%
Pension benefits | Service Cost |  |  |
Weighted-average assumptions used to determine net periodic benefit costs |  |  |
Discount rate | 2.80% | 2.90% | 3.70%
Pension benefits | Interest Cost |  |  |
Weighted-average assumptions used to determine net periodic benefit costs |  |  |
Discount rate | 2.10% | 2.20% | 3.20%
Postretirement benefits |  |  |
Weighted-average assumptions used to determine benefit obligations |  |  |
Discount rate | 4.80% | 2.70% | 2.80%
Postretirement benefits | Service Cost |  |  |
Weighted-average assumptions used to determine net periodic benefit costs |  |  |
Discount rate | 2.90% | 3.00% | 3.80%
Postretirement benefits | Interest Cost |  |  |
Weighted-average assumptions used to determine net periodic benefit costs |  |  |
Discount rate | 2.20% | 2.20% | 3.20%

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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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- Definition Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 8 -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e2919-114920 + Details
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