Retirement Benefits - Pensions (Details) - Pension Plans, Defined Benefit - USD ($) $ in Thousands	12 Months Ended
Jun. 30, 2019	Jun. 30, 2020
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Employer discretionary contribution	$ 200,000
Accumulated benefit obligation for all defined benefit plans	5,184,637	$ 6,102,038
Accumulated benefit obligation	$ 5,094,129	6,028,952
Expected cash contributions to defined benefit pension plans in next fiscal year		71,000
Estimated future benefit payments in the year ending June 30, 2021		266,011
Estimated future benefit payments in the year ending June 30, 2022		326,214
Estimated future benefit payments in the year ending June 30, 2023		284,379
Estimated future benefit payments in the year ending June 30, 2024		290,707
Estimated future benefit payments in the year ending June 30, 2025		302,169
Estimated future benefit payments in the aggregate for the five years ending June 30, 2026 through June 30, 2030		$ 1,606,648

Defined Benefit Plan, Plan Assets, Employer Discretionary Contribution Amount

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Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level.

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Amount of benefit for defined benefit plan expected to be paid in five fiscal years after fifth fiscal year following current fiscal year.

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Amount of benefit for defined benefit plan expected to be paid in next fiscal year following current fiscal year.

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Amount of benefit for defined benefit plan expected to be paid in fifth fiscal year following current fiscal year.

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Amount of benefit for defined benefit plan expected to be paid in fourth fiscal year following current fiscal year.

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Amount of benefit for defined benefit plan expected to be paid in third fiscal year following current fiscal year.

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Amount of benefit for defined benefit plan expected to be paid in second fiscal year following current fiscal year.

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Amount of contribution expected to be received by defined benefit plan from employer in next fiscal year following current fiscal year.

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Amount of accumulated benefit obligation for defined benefit plan with accumulated benefit obligation in excess of plan assets.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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