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Fair Value Measurements - Fair Value Hierarchy for Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Oct. 31, 2023 | Jan. 31, 2023
--- | --- | ---
Assets |  |
Short-term investments | $ 3,198,570 | $ 2,216,163
U.S. Treasury securities |  |
Assets |  |
Short-term investments | 764,158 | 316,197
Certificates of deposit |  |
Assets |  |
Short-term investments | 111,483 | 37,963
Asset-backed securities |  |
Assets |  |
Short-term investments | 570,502 | 442,958
Commercial paper |  |
Assets |  |
Short-term investments | 193,773 | 154,525
Corporate notes and bonds |  |
Assets |  |
Short-term investments | 1,405,372 | 1,207,964
Foreign government bonds |  |
Assets |  |
Short-term investments | 31,949 | 24,151
Municipal securities |  |
Assets |  |
Short-term investments | 72,420 |
U.S. agency obligations |  |
Assets |  |
Short-term investments | 48,913 | 32,405
Fair value, measurements recurring |  |
Assets |  |
Total financial assets | 3,365,457 | 2,426,929
Total financial liabilities | (693) |
Fair value, measurements recurring | Money market funds |  |
Assets |  |
Cash equivalents: | 150,895 | 180,895
Fair value, measurements recurring | U.S. Treasury securities |  |
Assets |  |
Cash equivalents: | 15,978 | 22,929
Short-term investments | 764,158 | 316,197
Fair value, measurements recurring | Certificates of deposit |  |
Assets |  |
Short-term investments | 111,483 | 37,963
Fair value, measurements recurring | Asset-backed securities |  |
Assets |  |
Short-term investments | 570,502 | 442,958
Fair value, measurements recurring | Commercial paper |  |
Assets |  |
Short-term investments | 193,773 | 154,525
Fair value, measurements recurring | Corporate notes and bonds |  |
Assets |  |
Cash equivalents: |  | 6,691
Short-term investments | 1,405,372 | 1,207,964
Fair value, measurements recurring | Foreign government bonds |  |
Assets |  |
Short-term investments | 31,949 | 24,151
Fair value, measurements recurring | Municipal securities |  |
Assets |  |
Short-term investments | 72,420 |
Fair value, measurements recurring | U.S. agency obligations |  |
Assets |  |
Short-term investments | 48,913 | 32,405
Fair value, measurements recurring | Foreign currency derivative contracts |  |
Assets |  |
Short-term investments | 14 | 251
Fair value, measurements recurring | Foreign currency derivative contracts |  |
Assets |  |
Foreign currency derivative contracts | (693) |
Fair value, measurements recurring | Level 1 |  |
Assets |  |
Total financial assets | 150,895 | 180,895
Total financial liabilities | 0 |
Fair value, measurements recurring | Level 1 | Money market funds |  |
Assets |  |
Cash equivalents: | 150,895 | 180,895
Fair value, measurements recurring | Level 1 | U.S. Treasury securities |  |
Assets |  |
Cash equivalents: | 0 | 0
Short-term investments | 0 | 0
Fair value, measurements recurring | Level 1 | Certificates of deposit |  |
Assets |  |
Short-term investments | 0 | 0
Fair value, measurements recurring | Level 1 | Asset-backed securities |  |
Assets |  |
Short-term investments | 0 | 0
Fair value, measurements recurring | Level 1 | Commercial paper |  |
Assets |  |
Short-term investments | 0 | 0
Fair value, measurements recurring | Level 1 | Corporate notes and bonds |  |
Assets |  |
Cash equivalents: |  | 0
Short-term investments | 0 | 0
Fair value, measurements recurring | Level 1 | Foreign government bonds |  |
Assets |  |
Short-term investments | 0 | 0
Fair value, measurements recurring | Level 1 | Municipal securities |  |
Assets |  |
Short-term investments | 0 |
Fair value, measurements recurring | Level 1 | U.S. agency obligations |  |
Assets |  |
Short-term investments | 0 | 0
Fair value, measurements recurring | Level 1 | Foreign currency derivative contracts |  |
Assets |  |
Short-term investments | 0 | 0
Fair value, measurements recurring | Level 1 | Foreign currency derivative contracts |  |
Assets |  |
Foreign currency derivative contracts | 0 |
Fair value, measurements recurring | Level 2 |  |
Assets |  |
Total financial assets | 3,214,562 | 2,246,034
Total financial liabilities | (693) |
Fair value, measurements recurring | Level 2 | Money market funds |  |
Assets |  |
Cash equivalents: | 0 | 0
Fair value, measurements recurring | Level 2 | U.S. Treasury securities |  |
Assets |  |
Cash equivalents: | 15,978 | 22,929
Short-term investments | 764,158 | 316,197
Fair value, measurements recurring | Level 2 | Certificates of deposit |  |
Assets |  |
Short-term investments | 111,483 | 37,963
Fair value, measurements recurring | Level 2 | Asset-backed securities |  |
Assets |  |
Short-term investments | 570,502 | 442,958
Fair value, measurements recurring | Level 2 | Commercial paper |  |
Assets |  |
Short-term investments | 193,773 | 154,525
Fair value, measurements recurring | Level 2 | Corporate notes and bonds |  |
Assets |  |
Cash equivalents: |  | 6,691
Short-term investments | 1,405,372 | 1,207,964
Fair value, measurements recurring | Level 2 | Foreign government bonds |  |
Assets |  |
Short-term investments | 31,949 | 24,151
Fair value, measurements recurring | Level 2 | Municipal securities |  |
Assets |  |
Short-term investments | 72,420 |
Fair value, measurements recurring | Level 2 | U.S. agency obligations |  |
Assets |  |
Short-term investments | 48,913 | 32,405
Fair value, measurements recurring | Level 2 | Foreign currency derivative contracts |  |
Assets |  |
Short-term investments | 14 | $ 251
Fair value, measurements recurring | Level 2 | Foreign currency derivative contracts |  |
Assets |  |
Foreign currency derivative contracts | $ (693) |

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