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Employee Benefit Plans - Other Changes in Plan Assets and Benefit Obligations Recognized in OCI (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Jun. 30, 2017
Jun. 30, 2019
Jun. 30, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Total AOCI   $ 63,652 $ 62,039
Unrecognized actuarial loss   (7,260) 6,553
Total recognized in OCI   (2,441) (8,675)
Net periodic benefit cost   12,424 1,579
Total recognized in net periodic benefit cost and OCI   9,983 (7,096)
Other Postretirement Benefits Plan      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Net (gain) loss subject to amortization   (5,160) (8,005)
Transition obligation recognized in AOCI   (6,936) (8,693)
Total AOCI   (12,096) (16,698)
Unrecognized actuarial loss   (2,010) 70
Total recognized in OCI   4,602 2,527
Net periodic benefit cost $ (798) (1,174) (1,154)
Total recognized in net periodic benefit cost and OCI   $ 3,428 $ 1,373