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Pension and Other Postretirement Benefits - Components of Net Periodic Pension (Income) Cost (Details) - Pension plans contribution [Member] - USD ($)
$ in Thousands
 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Net periodic pension income      
Service cost $ 1,685 $ 1,796 $ 1,627
Interest cost 23,188 27,320 31,901
Expected Return on Plans' Assets (53,653) (53,943) (53,789)
Amortization of transition obligation 94 88 91
Amortization of prior service cost 34 50 (19)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment (7) (115) 0
Special termination benefit charge 473 288 0
Settlement Loss 3,190 (51) 0
Recognition of actuarial losses 13,606 10,359 6,723
Net Periodic Benefit (Income) Cost $ (12,336) $ (14,208) $ (13,466)