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Investments - Narrative (Details) - USD ($)
12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Investments, Debt and Equity Securities [Abstract]    
Accrued interest $ 5,800,000 $ 3,800,000
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] Prepaid expenses and other current assets Prepaid expenses and other current assets
Unrealized losses related to debt securities $ 136,000 $ 3,698,000
Debt securities impairments loss 0 0
Debt securities credit losses 0 0
Fair value of debt securities which no credit losses were recognized $ 177,300,000 $ 547,500,000