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Equity Plans and Stock-based Compensation - Stock-based Compensation Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
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Jan. 31, 2026 | Jan. 31, 2025 | Jan. 31, 2024
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |
Total stock-based compensation expense | $ 64,694 | $ 75,651 | $ 117,337
Cost of revenue |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |
Total stock-based compensation expense | 4,702 | 5,102 | 6,154
Research and development |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |
Total stock-based compensation expense | 31,161 | 37,050 | 50,935
Sales and marketing |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |
Total stock-based compensation expense | 11,058 | 15,875 | 22,934
General and administrative |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |
Total stock-based compensation expense | $ 17,773 | $ 17,624 | $ 37,314

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