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Net Periodic Benefit Cost - Narrative (Details) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2024 USD ($) | Sep. 30, 2025 USD ($) | Sep. 30, 2024 USD ($) | Mar. 31, 2025 plan
Retirement Benefits [Abstract] |  |  |  |
Number of employee benefit plans terminated | plan |  |  |  | 1
Non-cash pension settlement | $ 23,201 | $ 0 | $ 23,201 |
Surplus from settlement of plan |  | 5,104 |  |
Defined benefit plan, surplus from settlement of plan, expected to be utilized in the next twelve months |  | 2,340 |  |
Defined benefit plan, expected future employer contributions |  | $ 4,099 |  |

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