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Pension and Other Postretirement Benefits - Components of Net Periodic Pension Income (Details) - USD ($)
$ in Thousands
 3 Months Ended
Sep. 30, 2024
Sep. 30, 2023
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 $ 228 297
Interest cost 8,505 8,907
Expected return on plan assets (10,662) (11,161)
Amortization of transition obligation 0 19
Amortization of prior service cost (credit) (2) (1)
Recognition of actuarial losses 2,102 1,444
Net periodic pension income $ 1,008 $ 495