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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, 2022
Mar. 31, 2021
Mar. 31, 2022
Mar. 31, 2021
Net periodic pension income        
Service cost $ 279 $ 429 $ 846 $ 1,264
Interest cost 5,631 5,815 16,931 17,371
Expected return on plan assets (12,985) (13,459) (39,020) (40,171)
Amortization of transition obligation 23 24 71 70
Amortization of prior service cost (credit) 3 8 9 25
Recognition of actuarial losses 2,918 3,431 8,829 10,190
Net periodic pension income $ (4,131) $ (3,752) $ (12,334) $ (11,251)