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Investments - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Mar. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Accrued interest	$ 1,900,000		$ 1,900,000		$ 300,000
Unrealized losses of debt securities	5,361,000		5,361,000		27,000
Debt securities credit losses	0	$ 0	0	$ 0
Fair value of debt securities which no credit losses were recognized	678,800,000		678,800,000
Available-for-sale Securities
Debt Securities, Available-for-sale [Line Items]
Unrealized losses of debt securities	$ 5,361,000		$ 5,361,000		$ 26,000

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