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Marketable Securities -Narrative (Details) | 12 Months Ended
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Jan. 31, 2024 USD ($) security | Jan. 31, 2023 USD ($) security | Jan. 31, 2022 USD ($)
Investments, Debt and Equity Securities [Abstract] |  |  |
Debt securities, available-for-sale, unrealized loss position, number of positions | security | 64 | 180 |
Investment income interest | $ 30,200,000 | $ 8,500,000 | $ 500,000
Unleased loss position | 178,700,000 | 220,900,000 |
Expected credit losses | $ 0 | $ 0 |

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