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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, 2025 | Sep. 30, 2024
Defined Benefit Plan Disclosure [Line Items] |  |
Defined Benefit Plan, Description | 0.8 million |
Net periodic other postretirement benefit costs |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement | $ 0 | $ (837)
Other postretirement benefit plans [Member] |  |
Net periodic other postretirement benefit costs |  |
Interest cost | 87 | 98
Amortization of prior service credit | (63) | (63)
Recognition of actuarial loss | 31 | 34
Net periodic other postretirement benefit cost | $ 55 | $ 69

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