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Pension and Other Postretirement Benefits - Components of Net Periodic Other Postretirement Benefit Cost (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Other postretirement benefit plans [Member]      
Net periodic other postretirement benefit costs      
Interest cost $ 307 $ 404 $ 613
Amortization of prior service credit (276) (276) (90)
Recognition of actuarial loss 307 257 248
Net Periodic Benefit (Income) Cost 338 385 771
Pension Plan [Member]      
Net periodic other postretirement benefit costs      
Service cost 1,685 1,796 1,627
Interest cost 23,188 27,320 31,901
Amortization of prior service credit 34 50 (19)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment (7) (115) 0
Recognition of actuarial loss 13,606 10,359 6,723
Net Periodic Benefit (Income) Cost $ (12,336) $ (14,208) $ (13,466)