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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, 2024
Mar. 31, 2023
Mar. 31, 2024
Mar. 31, 2023
Net periodic pension income        
Service cost $ 298 $ 243 $ 888 $ 718
Interest cost 8,901 8,085 26,665 24,127
Expected return on plan assets (11,156) (10,045) (33,442) (30,054)
Amortization of transition obligation 19 21 57 62
Amortization of prior service cost (credit) (1) 1 (4) 4
Recognition of actuarial losses 1,442 1,117 4,315 3,314
Net periodic pension income $ (497) $ (578) $ (1,521) $ (1,829)