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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, 2020
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Net periodic pension income        
Service cost $ 419 $ 445 $ 836 $ 895
Interest cost 5,783 6,832 11,557 13,656
Expected return on plan assets (13,365) (13,496) (26,711) (26,952)
Amortization of transition obligation 23 22 45 44
Amortization of prior service cost (credit) 8 13 17 25
Recognition of actuarial losses 3,386 2,585 6,758 5,180
Settlement gain 0 0 0 (122)
Net periodic pension income $ (3,746) $ (3,599) $ (7,498) $ (7,274)