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Investments - Narrative (Details) - USD ($)	Sep. 30, 2023	Mar. 31, 2023
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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