Pension and Other Postretirement Benefits - Hierarchy of Fair Value of the Benefit Plan Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Jun. 30, 2021
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plans', Fair Value of Plan Assets	$ 695,965	$ 890,104
Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plans', Fair Value of Plan Assets	26,451	43,777
Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plans', Fair Value of Plan Assets	596,013	707,543
NAV [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plans', Fair Value of Plan Assets	73,501	138,784
Corporate Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plans', Fair Value of Plan Assets	379,324	443,948
Corporate Fixed Income Securities [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plans', Fair Value of Plan Assets	379,324	443,948
Mutual Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plans', Fair Value of Plan Assets	24,528	48,446
Mutual Funds [Member] | NAV [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plans', Fair Value of Plan Assets	24,528	48,446
Blend Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plans', Fair Value of Plan Assets	48,973	90,338
Blend Funds [Member] | NAV [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plans', Fair Value of Plan Assets	48,973	90,338
Common Stock [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plans', Fair Value of Plan Assets	25,704	42,670
Common Stock [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plans', Fair Value of Plan Assets	25,704	42,670
US Government Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plans', Fair Value of Plan Assets	130,064	149,514
US Government Securities [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plans', Fair Value of Plan Assets	130,064	149,514
Foreign Government Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plans', Fair Value of Plan Assets	40,729	57,253
Foreign Government Securities [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plans', Fair Value of Plan Assets	40,729	57,253
Other Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plans', Fair Value of Plan Assets	20,248	21,107
Other Fixed Income Securities [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plans', Fair Value of Plan Assets	20,248	21,107
Other [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plans', Fair Value of Plan Assets	26,395	36,828
Other [Member] | Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plans', Fair Value of Plan Assets	747	1,107
Other [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plans', Fair Value of Plan Assets	$ 25,648	$ 35,721