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Employee Benefit Plans - Components of Net Periodic Benefit Costs (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Jun. 30, 2017
Jun. 30, 2019
Jun. 30, 2018
Defined Benefit Plan Disclosure      
Interest cost   $ 5,222 $ 5,729
Expected return on plan assets   (5,246) (5,824)
Amortization of net gain   1,506 1,674
Net periodic benefit cost   12,424 1,579
Other Postretirement Benefits Plan      
Defined Benefit Plan Disclosure      
Service cost $ 760 530 609
Interest cost 829 887 835
Amortization of net gain (630) (834) (841)
Amortization of prior service credit (1,757) (1,757) (1,757)
Net periodic benefit cost $ (798) $ (1,174) $ (1,154)