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Investments - Narrative (Details) - USD ($) | 12 Months Ended
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Mar. 31, 2024 | Mar. 31, 2023
Investments, Debt and Equity Securities [Abstract] |  |
Accrued interest | $ 3,800,000 | $ 2,800,000
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] | Prepaid expenses and other current assets |
Unrealized losses related to debt securities | $ 3,698,000 | 18,924,000
Debt securities impairments loss | 0 | 0
Debt securities credit losses | 0 | 0
Fair value of debt securities which no credit losses were recognized | $ 547,500,000 | $ 653,400,000

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- Definition Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 + Details
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