Pension and Other Postretirement Benefits - Components of Net Periodic Pension (Income) Cost (Details) - Pension plans contribution [Member] - USD ($) $ in Thousands	12 Months Ended
Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Net periodic pension income
Service cost	$ 1,796	$ 1,627	$ 1,635
Interest cost	27,320	31,901	30,751
Expected Return on Plans' Assets	(53,943)	(53,789)	(56,579)
Amortization of transition obligation	88	91	94
Amortization of prior service cost	50	(19)	48
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment	115	0	0
Special termination benefit charge	288	0	0
Settlement Loss	(51)	0	626
Recognition of actuarial losses	10,359	6,723	6,907
Net Periodic Benefit (Income) Cost	$ (14,208)	$ (13,466)	$ (16,518)

Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan.

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Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan.

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Amount of transition asset (obligation) recognized in net periodic benefit (cost) credit of defined benefit plan.

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Amount of cost of providing special or contractual termination benefits payable from defined benefit plan.

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Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan.

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Amount of cost recognized for passage of time related to defined benefit plan.

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Amount of net periodic benefit cost (credit) for defined benefit plan.

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Amount of gain (loss) recognized in net periodic benefit (cost) credit from event reducing expected years of future service of present employees or eliminating accrual of defined benefits for some or all future services of present employees.

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Amount of gain (loss) recognized in net periodic benefit (cost) credit from irrevocable action relieving primary responsibility for benefit obligation and eliminating risk related to obligation and assets used to effect settlement.

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Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

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