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, 2019	Jun. 30, 2018	Jun. 30, 2017
Net periodic pension income
Service cost	$ 1,627	$ 1,635	$ 2,908
Interest cost	31,901	30,751	31,113
Expected Return on Plans' Assets	(53,789)	(56,579)	(58,781)
Amortization of transition obligation	91	94	89
Amortization of prior service cost	(19)	48	(452)
Special termination benefit charge	0	0	98
Settlement Loss	0	626	379
Recognition of actuarial losses	6,723	6,907	8,356
Net Periodic Benefit (Income) Cost	$ (13,466)	$ (16,518)	$ (16,290)

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 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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