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Marketable Securities - Narrative (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Oct. 31, 2023 | Oct. 31, 2022 | Oct. 31, 2023 | Oct. 31, 2022 | Jan. 31, 2023
Investments, Debt and Equity Securities [Abstract] |  |  |  |  |
Investment income, interest | $ 7,800,000 | $ 2,500,000 | $ 21,700,000 | $ 4,100,000 |
Debt securities, available-for-sale, unrealized loss position, fair value | 393,300,000 |  | 393,300,000 |  | $ 220,900,000
Debt securities, available-for-sale, allowance for credit loss | $ 0 |  | $ 0 |  | $ 0

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