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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, 2017
Jun. 30, 2016
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), before Tax [Abstract]    
Unrecognized Net Actuarial Losses $ 246,428 $ 272,802
Unrecognized Net Prior Service Credits 580 155
Unrecognized Transition Obligations 622 740
Total $ 247,630 $ 273,697