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Investments - Narrative (Details) - USD ($) | Dec. 31, 2024 | Mar. 31, 2024
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Investments, Debt and Equity Securities [Abstract] |  |
Accrued interest | $ 5,200,000 | $ 3,800,000
Impairment on debt securities | 0 | 0
Debt securities credit losses | 0 | 0
Debt securities, available-for-sale, unrealized loss position | $ 166,814,000 | $ 547,490,000

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