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Pension and Other Postretirement Benefits - Components of Net Periodic Pension Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2025
Mar. 31, 2024
Net periodic pension income        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement       $ 0
Pension plans contribution [Member]        
Net periodic pension income        
Service cost $ 221 $ 298 $ 678 888
Interest cost 8,441 8,901 25,460 26,665
Expected return on plan assets (10,629) (11,156) (31,964) (33,442)
Amortization of transition obligation 0 19 0 57
Amortization of prior service cost (credit) (1) (1) (6) (4)
Recognition of actuarial losses 2,082 1,442 6,292 4,315
Net periodic pension income $ 114 $ 497 (1,296) 1,521
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement     $ 836 $ 0