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Investments - Narrative (Details) - USD ($)	3 Months Ended		6 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Mar. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Accrued interest	$ 2,000,000		$ 2,000,000		$ 2,100,000
Unrealized losses of debt securities	28,889,000		28,889,000		20,494,000
Impairment on debt securities	0		0
Debt securities credit losses	0	$ 0	0	$ 0
Fair value of debt securities which no credit losses were recognized	658,000,000		658,000,000
Impairment on debt securities during period		0		0
Available-for-sale Securities
Debt Securities, Available-for-sale [Line Items]
Unrealized losses of debt securities	$ 28,889,000	$ 0	$ 28,889,000	$ 0	$ 20,494,000

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