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Fair Value Measurements - Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Oct. 31, 2024 | Jan. 31, 2024
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Amortized Cost | $ 577,824 | $ 723,206
Gross Unrealized Gains | 655 | 264
Gross Unrealized Losses | (451) | (771)
Estimated Fair Value | 578,028 | 722,699
Cash | 477,200 | 444,800
Level 2 | Available-for-sale securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Amortized Cost | 446,088 | 424,689
Gross Unrealized Gains | 655 | 264
Gross Unrealized Losses | (451) | (771)
Estimated Fair Value | 446,292 | 424,182
Money market funds | Level 1 | Cash Equivalents |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Amortized Cost | 131,736 | 298,517
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 131,736 | 298,517
Commercial paper | Level 2 | Cash Equivalents |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Amortized Cost | 1,982 | 43,845
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (1) | (9)
Estimated Fair Value | 1,981 | 43,836
Commercial paper | Level 2 | Available-for-sale securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Amortized Cost | 66,970 | 42,958
Gross Unrealized Gains | 28 | 2
Gross Unrealized Losses | (16) | (25)
Estimated Fair Value | 66,982 | 42,935
Corporate notes and bonds | Level 2 | Available-for-sale securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Amortized Cost | 363,651 | 299,166
Gross Unrealized Gains | 625 | 262
Gross Unrealized Losses | (416) | (670)
Estimated Fair Value | 363,860 | 298,758
U.S. governmental securities | Level 2 | Cash Equivalents |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Amortized Cost |  | 9,968
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | (1)
Estimated Fair Value |  | 9,967
U.S. governmental securities | Level 2 | Available-for-sale securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Amortized Cost | 13,485 | 28,752
Gross Unrealized Gains | 2 | 0
Gross Unrealized Losses | (18) | (66)
Estimated Fair Value | $ 13,469 | $ 28,686

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