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Investments - Narrative (Details) - USD ($)	12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Investments, Debt and Equity Securities [Abstract]
Accrued interest	$ 2,800,000	$ 2,100,000
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	$ 18,924,000	20,494,000
Debt securities impairments loss	0
Debt securities credit losses	0	0
Fair value of debt securities which no credit losses were recognized	$ 653,400,000	$ 684,700,000

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- Definition

Debt Securities, Available-for-Sale, Allowance for Credit Loss, Expense

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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

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-SubTopic 10
-Section 50
-Paragraph 2
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 45
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