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Pension and Other Postretirement Benefits - Components of Net Periodic Other Postretirement Benefit Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Net periodic other postretirement benefit costs    
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement   $ 0
Defined Benefit Plan, Description 0.8 million  
Other postretirement benefit plans [Member]    
Net periodic other postretirement benefit costs    
Interest cost $ 98 107
Amortization of prior service credit (63) (63)
Recognition of actuarial loss 34 34
Net periodic other postretirement benefit cost $ 69 $ 78