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Pension and Other Postretirement Benefits - Plans with Accumulated Benefit Obligations Exceeding the Fair Value of Plan Assets (Details) - Pension plans contribution [Member] - USD ($)
$ in Thousands
Jun. 30, 2018
Jun. 30, 2017
Defined Benefit Plan Disclosure [Line Items]    
Project Benefit Obligation $ 152,485 $ 156,816
Accumulated Benefit Obligation 151,871 156,590
Fair Value of Plan Assets $ 0 $ 7,083