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Income Taxes - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Jan. 31, 2026 | Jan. 31, 2025 | Jan. 31, 2024 | Jan. 31, 2023
Income Tax Disclosure [Abstract] |  |  |  |
Increase in valuation allowance | $ 36,700 | $ 46,900 | $ 110,700 |
Operating Loss Carryforwards [Line Items] |  |  |  |
Increase in valuation allowance | 36,700 | 46,900 | 110,700 |
Indefinite domestic operating loss carryforward | 974,900 |  |  |
Unrecognized tax benefits | 39,070 | $ 35,533 | $ 32,093 | $ 25,762
Federal |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Operating loss carryforwards | 1,163,600 |  |  |
Research tax credit carryforward | 41,200 |  |  |
Operating loss carryforward subject to expiration | 17,100 |  |  |
State |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Operating loss carryforwards | 456,200 |  |  |
Research tax credit carryforward | 43,300 |  |  |
Operating loss carryforward subject to expiration | 4,700 |  |  |
Other States |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Operating loss carryforwards , expires | 515,800 |  |  |
California |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Operating loss carryforward subject to expiration | $ 17,500 |  |  |

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