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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Oct. 31, 2023 | Jan. 31, 2023
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Amortized Cost | $ 1,222,649 | $ 643,215
Gross Unrealized Gains | 0 | 105
Gross Unrealized Losses | (2,366) | (4,501)
Estimated Fair Value | 1,220,283 | 638,819
Cash | 425,400 | 578,900
Level 2 | Available-for-sale securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Amortized Cost | 525,182 | 510,206
Gross Unrealized Gains | 0 | 105
Gross Unrealized Losses | (2,366) | (4,501)
Estimated Fair Value | 522,816 | 505,810
Money market funds | Level 1 | Cash Equivalents |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Amortized Cost | 697,467 | 133,009
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 697,467 | 133,009
Commercial paper | Level 2 | Cash Equivalents |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Amortized Cost | 26,950 | 9,992
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (5) | (2)
Estimated Fair Value | 26,945 | 9,990
Commercial paper | Level 2 | Available-for-sale securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Amortized Cost | 96,544 | 85,957
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (37) | (258)
Estimated Fair Value | 96,507 | 85,699
U.S. governmental securities | Level 2 | Cash Equivalents |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Amortized Cost | 38,784 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | 0 |
Estimated Fair Value | 38,784 |
U.S. governmental securities | Level 2 | Available-for-sale securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Amortized Cost | 105,680 | 38,344
Gross Unrealized Gains | 0 | 4
Gross Unrealized Losses | (250) | (405)
Estimated Fair Value | 105,430 | 37,943
Corporate notes and bonds | Level 2 | Available-for-sale securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Amortized Cost | 257,224 | 367,930
Gross Unrealized Gains | 0 | 101
Gross Unrealized Losses | (2,074) | (3,771)
Estimated Fair Value | $ 255,150 | 364,260
Municipal notes and bonds | Level 2 | Available-for-sale securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Amortized Cost |  | 7,983
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | (65)
Estimated Fair Value |  | $ 7,918

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