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Cash Equivalents and Investments - Schedule of Cash and Cash Equivalents and Investments Fair Value (Details) - USD ($) $ in Thousands | Jul. 31, 2022 | Jan. 31, 2022
--- | --- | ---
Cash equivalents: |  |
Amortized Cost | $ 678,199 | $ 845,234
Gross Unrealized Gains | 0 | 1
Gross Unrealized Losses | (21) | (5)
Estimated Fair Value | 678,178 | 845,230
Investments: |  |
Amortized Cost | 4,177,037 | 4,037,943
Gross Unrealized Gains | 684 | 204
Gross Unrealized Losses | (44,560) | (15,576)
Estimated Fair Value | 4,133,161 | 4,022,571
Amortized Cost | 4,855,236 | 4,883,177
Gross Unrealized Gains | 684 | 205
Gross Unrealized Losses | (44,581) | (15,581)
Estimated Fair Value | 4,811,339 | 4,867,801
Commercial paper |  |
Investments: |  |
Amortized Cost | 893,431 | 884,376
Gross Unrealized Gains | 224 | 81
Gross Unrealized Losses | (3,852) | (821)
Estimated Fair Value | 889,803 | 883,636
Corporate notes and bonds |  |
Investments: |  |
Amortized Cost | 2,464,401 | 2,610,010
Gross Unrealized Gains | 97 | 91
Gross Unrealized Losses | (30,226) | (12,062)
Estimated Fair Value | 2,434,272 | 2,598,039
U.S. government and agency securities |  |
Investments: |  |
Amortized Cost | 528,941 | 439,449
Gross Unrealized Gains | 304 | 28
Gross Unrealized Losses | (9,640) | (2,558)
Estimated Fair Value | 519,605 | 436,919
Certificates of deposit |  |
Investments: |  |
Amortized Cost | 290,264 | 104,108
Gross Unrealized Gains | 59 | 4
Gross Unrealized Losses | (842) | (135)
Estimated Fair Value | 289,481 | 103,977
Money market funds |  |
Cash equivalents: |  |
Amortized Cost | 590,661 | 722,492
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 590,661 | 722,492
Commercial paper |  |
Cash equivalents: |  |
Amortized Cost | 71,835 | 77,795
Gross Unrealized Gains | 0 | 1
Gross Unrealized Losses | (14) | (2)
Estimated Fair Value | 71,821 | 77,794
U.S. government and agency securities |  |
Cash equivalents: |  |
Amortized Cost |  | 36,997
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | (2)
Estimated Fair Value |  | 36,995
Corporate notes and bonds |  |
Cash equivalents: |  |
Amortized Cost | 15,703 | 7,950
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (7) | (1)
Estimated Fair Value | $ 15,696 | $ 7,949

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