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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, 2023
Dec. 31, 2022
Dec. 31, 2023
Dec. 31, 2022
Net periodic other postretirement benefit costs        
Interest cost $ 106 $ 104 $ 212 $ 209
Amortization of prior service credit (63) (68) (127) (136)
Recognition of actuarial loss 35 48 71 96
Net periodic other postretirement benefit cost $ 78 $ 84 $ 156 $ 169