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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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