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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, 2024 | Jan. 31, 2024
--- | --- | ---
Assets |  |
Short-term investments | $ 3,567,841 | $ 3,324,269
U.S. Treasury securities |  |
Assets |  |
Short-term investments | 635,348 | 714,459
Commercial paper |  |
Assets |  |
Short-term investments | 284,018 | 144,245
Certificates of deposit |  |
Assets |  |
Short-term investments | 98,618 | 94,283
Asset-backed securities |  |
Assets |  |
Short-term investments | 656,355 | 606,981
Corporate notes and bonds |  |
Assets |  |
Short-term investments | 1,707,067 | 1,585,029
Foreign government bonds |  |
Assets |  |
Short-term investments | 54,378 | 50,206
Municipal securities |  |
Assets |  |
Short-term investments | 76,348 | 79,474
U.S. agency obligations |  |
Assets |  |
Short-term investments | 55,709 | 49,592
Fair value, measurements recurring |  |
Assets |  |
Total financial assets | 3,963,452 | 3,408,051
Liabilities |  |
Total financial liabilities | (806) | (232)
Fair value, measurements recurring | Money market funds |  |
Assets |  |
Cash equivalents: | 292,069 | 73,197
Fair value, measurements recurring | U.S. Treasury securities |  |
Assets |  |
Cash equivalents: | 67,891 | 9,969
Short-term investments | 635,348 | 714,459
Fair value, measurements recurring | Commercial paper |  |
Assets |  |
Cash equivalents: | 35,543 |
Short-term investments | 284,018 | 144,245
Fair value, measurements recurring | Certificates of deposit |  |
Assets |  |
Short-term investments | 98,618 | 94,283
Fair value, measurements recurring | Asset-backed securities |  |
Assets |  |
Short-term investments | 656,355 | 606,981
Fair value, measurements recurring | Corporate notes and bonds |  |
Assets |  |
Short-term investments | 1,707,067 | 1,585,029
Fair value, measurements recurring | Foreign government bonds |  |
Assets |  |
Short-term investments | 54,378 | 50,206
Fair value, measurements recurring | Municipal securities |  |
Assets |  |
Short-term investments | 76,348 | 79,474
Fair value, measurements recurring | U.S. agency obligations |  |
Assets |  |
Short-term investments | 55,709 | 49,592
Fair value, measurements recurring | Foreign currency derivative contracts |  |
Assets |  |
Short-term investments | 108 | 616
Fair value, measurements recurring | Foreign currency derivative contracts |  |
Liabilities |  |
Foreign currency derivative contracts | (806) | (232)
Fair value, measurements recurring | Level 1 |  |
Assets |  |
Total financial assets | 292,069 | 73,197
Liabilities |  |
Total financial liabilities | 0 | 0
Fair value, measurements recurring | Level 1 | Money market funds |  |
Assets |  |
Cash equivalents: | 292,069 | 73,197
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 | Commercial paper |  |
Assets |  |
Cash equivalents: | 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 | Corporate notes and bonds |  |
Assets |  |
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 | 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 |  |
Liabilities |  |
Foreign currency derivative contracts | 0 | 0
Fair value, measurements recurring | Level 2 |  |
Assets |  |
Total financial assets | 3,671,383 | 3,334,854
Liabilities |  |
Total financial liabilities | (806) | (232)
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: | 67,891 | 9,969
Short-term investments | 635,348 | 714,459
Fair value, measurements recurring | Level 2 | Commercial paper |  |
Assets |  |
Cash equivalents: | 35,543 |
Short-term investments | 284,018 | 144,245
Fair value, measurements recurring | Level 2 | Certificates of deposit |  |
Assets |  |
Short-term investments | 98,618 | 94,283
Fair value, measurements recurring | Level 2 | Asset-backed securities |  |
Assets |  |
Short-term investments | 656,355 | 606,981
Fair value, measurements recurring | Level 2 | Corporate notes and bonds |  |
Assets |  |
Short-term investments | 1,707,067 | 1,585,029
Fair value, measurements recurring | Level 2 | Foreign government bonds |  |
Assets |  |
Short-term investments | 54,378 | 50,206
Fair value, measurements recurring | Level 2 | Municipal securities |  |
Assets |  |
Short-term investments | 76,348 | 79,474
Fair value, measurements recurring | Level 2 | U.S. agency obligations |  |
Assets |  |
Short-term investments | 55,709 | 49,592
Fair value, measurements recurring | Level 2 | Foreign currency derivative contracts |  |
Assets |  |
Short-term investments | 108 | 616
Fair value, measurements recurring | Level 2 | Foreign currency derivative contracts |  |
Liabilities |  |
Foreign currency derivative contracts | $ (806) | $ (232)

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