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Pension and Other Postretirement Benefits - Amounts Related to Defined Pension Plans Recognized in Accumulated Other Comprehensive (Loss) Income (Details) - Pension plans contribution [Member] - USD ($)
$ in Thousands
Jun. 30, 2021
Jun. 30, 2020
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract]    
Unrecognized Net Actuarial Losses $ 279,628 $ 305,903
Unrecognized Net Prior Service Costs 2,001 2,026
Unrecognized Transition Obligations 277 332
Total $ 281,906 $ 308,261