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Marketable Securities - Investment Income (Details) - USD ($) $ in Thousands | 3 Months Ended
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Apr. 30, 2026 | Apr. 30, 2025
Investments, Debt and Equity Securities [Abstract] |  |
Interest income | $ 2,985 | $ 4,781
Accretion/amortization of discount/premium, net | 78 | 399
Investment income | $ 3,063 | $ 5,180

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- Definition Amount before accretion (amortization) of purchase discount (premium) of interest income and dividend income on nonoperating securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(7)(a)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(7)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2 + Details
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