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Pension and Other Postretirement Benefits - Components of Net Periodic Other Postretirement Benefit Cost (Details) - Other postretirement benefit plans [Member] - USD ($)
$ in Thousands
 12 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2014
Net periodic other postretirement benefit costs      
Service cost $ 0 $ 45 $ 55
Interest cost 840 934 1,006
Amortization of prior service credit (22) (59) (111)
Recognition of actuarial loss 324 492 317
Curtailment Gain 0 (221) 0
Net Periodic Benefit (Income) Cost $ 1,142 $ 1,191 $ 1,267