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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 6 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2023
Dec. 31, 2022
Net periodic pension income        
Service cost $ 293 $ 235 $ 590 $ 474
Interest cost 8,857 8,002 17,764 16,042
Expected return on plan assets (11,125) (9,983) (22,286) (20,008)
Amortization of transition obligation 19 20 38 41
Amortization of prior service cost (credit) (1) 2 (2) 4
Recognition of actuarial losses 1,428 1,092 2,872 2,197
Net periodic pension income $ (529) $ (632) $ (1,024) $ (1,250)