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Employee Benefit Plans - Other Changes in Plan Assets and Benefit Obligations Recognized in OCI (Details) - USD ($)
$ in Thousands
12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2015
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total AOCI $ 60,099 $ 63,632  
Other Postretirement Benefits Plan      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Net (gain) loss subject to amortization (8,775) (7,027)  
Transition obligation recognized in AOCI (10,450) (12,207)  
Total AOCI (19,225) (19,234)  
Unrecognized actuarial loss 2,377 4,259  
Total recognized in OCI 10 (2,306)  
Net periodic benefit cost (credit) (798) 629 $ (119)
Total recognized in net periodic benefit cost and OCI $ (788) $ (1,677)