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Pension and Other Postretirement Benefits - Hierarchy of Fair Value of the Benefit Plan Assets (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Jun. 30, 2020
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plans', Fair Value of Plan Assets | $ 890,104 | $ 876,036
Level 1 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plans', Fair Value of Plan Assets | 43,777 | 40,897
Level 2 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plans', Fair Value of Plan Assets | 707,543 | 680,798
NAV [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plans', Fair Value of Plan Assets | 138,784 | 154,341
Corporate Fixed Income Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plans', Fair Value of Plan Assets | 443,948 | 394,521
Corporate Fixed Income Securities [Member] | Level 2 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plans', Fair Value of Plan Assets | 443,948 | 394,521
Value Funds [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plans', Fair Value of Plan Assets | 48,446 | 59,674
Balanced Funds [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plans', Fair Value of Plan Assets | 90,338 | 94,667
Balanced Funds [Member] | NAV [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plans', Fair Value of Plan Assets | 90,338 | 94,667
Common Stock [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plans', Fair Value of Plan Assets | 42,670 | 38,487
Common Stock [Member] | Level 1 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plans', Fair Value of Plan Assets | 42,670 | 38,487
US Government Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plans', Fair Value of Plan Assets | 149,514 | 178,364
US Government Securities [Member] | Level 2 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plans', Fair Value of Plan Assets | 149,514 | 178,364
Foreign Government Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plans', Fair Value of Plan Assets | 57,253 | 61,153
Foreign Government Securities [Member] | Level 2 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plans', Fair Value of Plan Assets | 57,253 | 61,153
Other Fixed Income Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plans', Fair Value of Plan Assets | 21,107 | 22,544
Other Fixed Income Securities [Member] | Level 2 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plans', Fair Value of Plan Assets | 21,107 | 22,544
Other [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plans', Fair Value of Plan Assets | 36,828 | 26,626
Other [Member] | Level 1 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plans', Fair Value of Plan Assets | 1,107 | 2,410
Other [Member] | Level 2 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plans', Fair Value of Plan Assets | $ 35,721 | $ 24,216

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