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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, 2024
Jun. 30, 2023
Jun. 30, 2022
Net periodic other postretirement benefit costs      
Special termination benefit charge   $ 431 $ 277
Other postretirement benefit plans [Member]      
Net periodic other postretirement benefit costs      
Interest cost $ 424 417 288
Amortization of prior service credit (254) (271) (276)
Recognition of actuarial loss 142 192 297
Net Periodic Benefit (Income) Cost 312 338 309
Pension Plan [Member]      
Net periodic other postretirement benefit costs      
Service cost 1,181 963 1,117
Interest cost 35,551 32,235 22,532
Amortization of prior service credit (4) 5 13
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment 0 (1) (2)
Recognition of actuarial loss 5,753 4,440 11,702
Special termination benefit charge 14    
Net Periodic Benefit (Income) Cost $ (2,025) $ (1,950) $ (15,990)