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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
Sep. 30, 2021
Sep. 30, 2020
Net periodic pension income    
Service cost $ 286 $ 416
Interest cost 5,659 5,775
Expected return on plan assets (13,037) (13,346)
Amortization of transition obligation 24 23
Amortization of prior service cost (credit) 3 8
Recognition of actuarial losses 2,970 3,372
Net periodic pension income $ (4,095) $ (3,752)