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Fair Value Measurements - Schedule of Fair Value Hierarchy for Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Apr. 30, 2026 | Jan. 31, 2026
--- | --- | ---
Assets |  |
Short-term investments | $ 5,416,139 | $ 5,139,581
Total financial assets | 5,976,841 | 5,429,518
Liabilities |  |
Total financial liabilities | (791) | (3,187)
Money market funds |  |
Assets |  |
Cash equivalents: | 560,643 | 286,504
U.S. Treasury securities |  |
Assets |  |
Cash equivalents: |  | 2,611
Short-term investments | 1,585,405 | 1,337,466
Certificates of deposit |  |
Assets |  |
Short-term investments | 27,669 | 27,690
Asset-backed securities |  |
Assets |  |
Short-term investments | 205,966 | 261,917
Commercial paper |  |
Assets |  |
Short-term investments | 44,753 | 75,375
Corporate notes and bonds |  |
Assets |  |
Short-term investments | 3,289,706 | 3,154,559
Foreign government bonds |  |
Assets |  |
Short-term investments | 219,696 | 233,401
Municipal securities |  |
Assets |  |
Short-term investments | 41,456 | 37,453
U.S. agency obligations |  |
Assets |  |
Short-term investments | 1,488 | 11,720
Foreign currency derivative contracts |  |
Assets |  |
Short-term investments | 59 | 822
Foreign currency derivative contracts |  |
Liabilities |  |
Foreign currency derivative contracts | (791) | (3,187)
Level 1 |  |
Assets |  |
Total financial assets | 560,643 | 286,504
Liabilities |  |
Total financial liabilities | 0 | 0
Level 1 | Money market funds |  |
Assets |  |
Cash equivalents: | 560,643 | 286,504
Level 1 | U.S. Treasury securities |  |
Assets |  |
Cash equivalents: |  | 0
Short-term investments | 0 | 0
Level 1 | Certificates of deposit |  |
Assets |  |
Short-term investments | 0 | 0
Level 1 | Asset-backed securities |  |
Assets |  |
Short-term investments | 0 | 0
Level 1 | Commercial paper |  |
Assets |  |
Short-term investments | 0 | 0
Level 1 | Corporate notes and bonds |  |
Assets |  |
Short-term investments | 0 | 0
Level 1 | Foreign government bonds |  |
Assets |  |
Short-term investments | 0 | 0
Level 1 | Municipal securities |  |
Assets |  |
Short-term investments | 0 | 0
Level 1 | U.S. agency obligations |  |
Assets |  |
Short-term investments | 0 | 0
Level 1 | Foreign currency derivative contracts |  |
Assets |  |
Short-term investments | 0 | 0
Level 1 | Foreign currency derivative contracts |  |
Liabilities |  |
Foreign currency derivative contracts | 0 | 0
Level 2 |  |
Assets |  |
Total financial assets | 5,416,198 | 5,143,014
Liabilities |  |
Total financial liabilities | (791) | (3,187)
Level 2 | Money market funds |  |
Assets |  |
Cash equivalents: | 0 | 0
Level 2 | U.S. Treasury securities |  |
Assets |  |
Cash equivalents: |  | 2,611
Short-term investments | 1,585,405 | 1,337,466
Level 2 | Certificates of deposit |  |
Assets |  |
Short-term investments | 27,669 | 27,690
Level 2 | Asset-backed securities |  |
Assets |  |
Short-term investments | 205,966 | 261,917
Level 2 | Commercial paper |  |
Assets |  |
Short-term investments | 44,753 | 75,375
Level 2 | Corporate notes and bonds |  |
Assets |  |
Short-term investments | 3,289,706 | 3,154,559
Level 2 | Foreign government bonds |  |
Assets |  |
Short-term investments | 219,696 | 233,401
Level 2 | Municipal securities |  |
Assets |  |
Short-term investments | 41,456 | 37,453
Level 2 | U.S. agency obligations |  |
Assets |  |
Short-term investments | 1,488 | 11,720
Level 2 | Foreign currency derivative contracts |  |
Assets |  |
Short-term investments | 59 | 822
Level 2 | Foreign currency derivative contracts |  |
Liabilities |  |
Foreign currency derivative contracts | $ (791) | $ (3,187)

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