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Pension and Other Postretirement Benefits - Funded Status of Other Postretirement Benefit Plans and Amounts Recognized in the Consolidated Balance Sheets (Details) - Other Postretirement Benefit Plan, Defined Benefit [Member] - USD ($)
$ in Thousands
 12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2015
Change in Benefit Obligation      
Benefit Obligation, Beginning of Year $ 20,542 $ 21,205  
Service Cost 0 0 $ 45
Interest Cost 673 840 934
Actuarial Losses (747) 722  
Benefits Paid (2,308) (2,225)  
Benefit Obligation, End of Year 18,160 20,542 $ 21,205
Funded Status of Plans (18,160) (20,542)  
Amounts Recognized in Balance Sheet      
Short-term Accrued Benefit Obligation (1,254) (1,666)  
Accrued Postretirement Benefits (16,906) (18,876)  
Net Amount Recognized $ (18,160) $ (20,542)