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Pension and Other Postretirement Benefits - Narrative (Details) $ in Thousands | 12 Months Ended
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Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2018 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |
Eligible Age for Availing Postretirement Healthcare Benefits | 65 |  |
Net Periodic Defined Benefits Expense (Reversal of Expense), Excluding Service Cost Component | $ (15,600) | $ (14,300) | $ (17,300)
Defined Contribution Plan [Abstract] |  |  |
Defined Contribution Plan, Cost | 14,700 | 16,300 | 19,600
Pension plans contribution [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Settlement | (1,286) | 0 |
Accumulated Benefit Obligation for all Defined Benefit Pension Plans | 1,001,800 | 962,900 |
Net Periodic Pension Cost | (14,208) | (13,466) | (16,518)
Special termination benefit charge | 288 | 0 | 0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement | 51 | 0 | (626)
Projected Benefit Payments for 2021 | 51,400 |  |
Projected Benefit Payments for 2022 | 52,100 |  |
Projected Benefit Payments for 2023 | 52,800 |  |
Projected Benefit Payments for 2024 | 54,900 |  |
Projected Benefit Payments for 2025 | 56,000 |  |
Projected Benefit Payments for 2026 through 2030 | 271,400 |  |
Accumulated Other Comprehensive Loss Expected to be Recognized in Net Periodic Pension Cost during 2021 related to Net Actuarial Losses | 13,300 |  |
Estimated Future Employer Contributions in 2021 | 8,000 |  |
Service Cost | 1,796 | 1,627 | 1,635
Other postretirement benefit plans [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net Periodic Pension Cost | 385 | $ 771 | $ 887
Projected Benefit Payments for 2021 | 1,300 |  |
Projected Benefit Payments for 2022 | 1,200 |  |
Projected Benefit Payments for 2023 | 1,200 |  |
Projected Benefit Payments for 2024 | 1,100 |  |
Projected Benefit Payments for 2025 | 1,000 |  |
Projected Benefit Payments for 2026 through 2030 | 3,900 |  |
Accumulated Other Comprehensive Loss Expected to be Recognized in Net Periodic Pension Cost during 2021 related to Net Actuarial Losses | 300 |  |
Accumulated Other Comprehensive Income Expected to be Recognized in Net Periodic Pension Cost during 2021 related to Prior Service Credit | (300) |  |
Estimated Future Employer Contributions in 2021 | $ 1,000 |  |

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