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Pension and Other Postretirement Benefits - Components of Net Periodic Pension Income (Details) - Pension plans contribution [Member] - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2023
Mar. 31, 2022
Net periodic pension income        
Service cost $ 243 $ 279 $ 718 $ 846
Interest cost 8,085 5,631 24,127 16,931
Expected return on plan assets (10,045) (12,985) (30,054) (39,020)
Amortization of transition obligation 21 23 62 71
Amortization of prior service cost (credit) 1 3 4 9
Recognition of actuarial losses 1,117 2,918 3,314 8,829
Net periodic pension income $ (578) $ (4,131) $ (1,829) $ (12,334)