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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, 2019
Jun. 30, 2018
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract]    
Unrecognized Net Actuarial Losses $ 292,992 $ 247,230
Unrecognized Net Prior Service Costs 2,229 723
Unrecognized Transition Obligations 432 539
Total $ 295,653 $ 248,492