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Stock-Based Compensation - Share-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 | $ 259,824 | $ 11,001 | $ 13,255
Stock-based compensation included in capitalized internally developed software | 0 | (1,637) | (1,409)
Total stock-based compensation expense, net of amounts capitalized | 259,824 | 9,364 | 11,846
Product development |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |
Total stock-based compensation expense | 127,414 | 7,325 | 8,692
General and administrative |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |
Total stock-based compensation expense | 110,677 | 2,041 | 2,647
Marketing |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |
Total stock-based compensation expense | 8,472 | 536 | 582
Operations and support |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |
Total stock-based compensation expense | $ 13,261 | $ 1,099 | $ 1,334

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