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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, 2015
Jun. 30, 2014
Jun. 30, 2013
Change in Benefit Obligation      
Benefit Obligation, Beginning of Year $ 24,476 $ 21,422  
Service Cost 45 55 $ 72
Interest Cost 934 1,006 938
Actuarial Losses 1,489 3,658  
Benefits Paid (2,155) (1,665)  
Benefit Obligation, End of Year 21,205 24,476 $ 21,422
Funded Status of Plans (21,205) (24,476)  
Amounts Recognized in Balance Sheet      
Short-term Accrued Benefit Obligation (1,975) (1,960)  
Accrued Postretirement Benefits (19,230) (22,516)  
Net Amount Recognized $ (21,205) $ (24,476)