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Marketable Securities - Investment Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jul. 31, 2024 | Jul. 31, 2023 | Jul. 31, 2024 | Jul. 31, 2023
Investments, Debt and Equity Securities [Abstract] |  |  |  |
Interest income | $ 4,455 | $ 3,245 | $ 8,615 | $ 6,173
Accretion/amortization of discount/premium, net | 556 | 520 | 1,043 | 991
Investment income | $ 5,011 | $ 3,765 | $ 9,658 | $ 7,164

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