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Cash Equivalents, Investments, and Strategic Investments - Unrealized Gain (Loss) on Investments (Details) - USD ($) $ in Thousands | 3 Months Ended
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Apr. 30, 2026 | Apr. 30, 2025
Debt and Equity Securities, FV-NI [Line Items] |  |
Impairments | $ (2,000) | $ (26,521)
Net unrealized gains (losses) on marketable equity securities | 364 | (4,468)
Net unrealized gains (losses) on strategic investments in equity securities | (1,636) | (30,989)
Net unrealized gains (losses) on strategic investments in equity securities | (1,862) | 1,304
Change in fair value of a non-marketable debt security accounted for under fair value option | (6,000) | 0
Total—included in other expense, net | (9,498) | $ (29,685)
Observe, Inc. |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Equity interest remeasurement loss | $ 2,200 |

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