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Investments - Narrative (Details) - USD ($)	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Investments, Debt and Equity Securities [Abstract]
Accrued interest	$ 2,100,000	$ 300,000
Unrealized losses related to debt securities	20,494,000	27,000
Debt securities impairments loss	0
Debt securities credit losses	0	$ 0
Fair value of debt securities which no credit losses were recognized	$ 684,700,000

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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).

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Amount, after allowance for credit loss, of accrued interest on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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-Publisher FASB
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Amount of expense (reversal of expense) for expected credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), from change in present value of expected cash flows.

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