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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, 2020
Jun. 30, 2019
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract]    
Unrecognized Net Actuarial Losses $ 305,903 $ 292,992
Unrecognized Net Prior Service Costs 2,026 2,229
Unrecognized Transition Obligations 332 432
Total $ 308,261 $ 295,653