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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, 2016
Jun. 30, 2015
Defined Benefit Plan Disclosure [Line Items]    
Project Benefit Obligation $ 877,146 $ 165,281
Accumulated Benefit Obligation 875,233 164,913
Fair Value of Plan Assets $ 684,512 $ 7,394