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Investments - Narrative (Details) - USD ($) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2025 | Mar. 31, 2025
Investments, Debt and Equity Securities [Abstract] |  |
Accrued interest | $ 5,800,000 | $ 5,800,000
Unrealized loss on debt securities | 0 | 0
Impairment on debt securities | 0 | 0
Debt securities credit losses | 0 | 0
Debt securities, available-for-sale, unrealized loss position | $ 115,200,000 | $ 177,300,000

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