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Investments - Narrative (Details) - USD ($) | Sep. 30, 2023 | Mar. 31, 2023
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Debt Securities, Available-for-sale [Line Items] |  |
Accrued interest | $ 2,500,000 | $ 2,800,000
Unrealized losses of debt securities | 11,987,000 | 18,924,000
Impairment on debt securities | 0 | 0
Debt securities credit losses | 0 | 0
Fair value of debt securities which no credit losses were recognized | 587,952,000 | 653,372,000
Marketable Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Unrealized losses of debt securities | $ 11,984,000 | $ 18,924,000

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