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Pension and Other Postretirement Benefits - Hierarchy of Fair Value of the Benefit Plan Assets (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Jun. 30, 2023
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plans', Fair Value of Plan Assets | $ 636,088 | $ 650,180
Level 1 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plans', Fair Value of Plan Assets | 6,408 | 15,155
Level 2 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plans', Fair Value of Plan Assets | 550,157 | 556,613
NAV [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plans', Fair Value of Plan Assets | 79,523 | 78,412
Corporate Fixed Income Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plans', Fair Value of Plan Assets | 329,284 | 356,263
Corporate Fixed Income Securities [Member] | Level 2 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plans', Fair Value of Plan Assets | 329,284 | 356,263
Mutual Funds [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plans', Fair Value of Plan Assets | 28,721 | 27,800
Mutual Funds [Member] | NAV [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plans', Fair Value of Plan Assets | 28,721 | 27,800
Blend Funds [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plans', Fair Value of Plan Assets | 50,802 | 50,612
Blend Funds [Member] | NAV [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plans', Fair Value of Plan Assets | 50,802 | 50,612
Common Stock [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plans', Fair Value of Plan Assets | 6,408 | 14,438
Common Stock [Member] | Level 1 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plans', Fair Value of Plan Assets | 6,408 | 14,438
US Government Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plans', Fair Value of Plan Assets | 102,806 | 105,624
US Government Securities [Member] | Level 2 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plans', Fair Value of Plan Assets | 102,806 | 105,624
Foreign Government Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plans', Fair Value of Plan Assets | 63,234 | 28,050
Foreign Government Securities [Member] | Level 2 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plans', Fair Value of Plan Assets | 63,234 | 28,050
Other Fixed Income Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plans', Fair Value of Plan Assets | 30,756 | 55,404
Other Fixed Income Securities [Member] | Level 2 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plans', Fair Value of Plan Assets | 30,756 | 55,404
Other [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plans', Fair Value of Plan Assets | 24,077 | 11,989
Other [Member] | Level 1 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plans', Fair Value of Plan Assets | 0 | 717
Other [Member] | Level 2 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plans', Fair Value of Plan Assets | $ 24,077 | $ 11,272

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