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Pension and Other Postretirement Benefits - Components of Net Periodic Other Postretirement Benefit Cost (Details) - Other postretirement benefit plans [Member] - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Net periodic other postretirement benefit costs        
Interest cost $ 76 $ 101 $ 153 $ 202
Amortization of prior service credit (69) (69) (138) (138)
Recognition of actuarial loss 77 64 154 128
Net periodic other postretirement benefit cost $ 84 $ 96 $ 169 $ 192