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Pension and Other Postretirement Benefits - Narrative (Details) $ in Thousands	12 Months Ended
	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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