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Marketable Securities - Narrative (Details) | 3 Months Ended |
--- | --- | ---
Apr. 30, 2024 USD ($) security | Apr. 30, 2023 USD ($) | Jan. 31, 2024 USD ($) security
Investments, Debt and Equity Securities [Abstract] |  |  |
Investment income, interest | $ 8,300,000 | $ 6,000,000 |
Debt securities, available-for-sale, unrealized loss position, number of positions | security | 137 |  | 64
Debt securities, available-for-sale, unrealized loss position, fair value | $ 357,600,000 |  | $ 178,700,000
Debt securities, available-for-sale, allowance for credit loss | $ 0 |  | $ 0

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