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Fair Value Measurements - Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Jan. 31, 2025 | Jan. 31, 2024
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Amortized Cost | $ 632,786 | $ 723,206
Gross Unrealized Gains | 535 | 264
Gross Unrealized Losses | (407) | (771)
Estimated Fair Value | 632,914 | 722,699
Cash | 464,700 | 444,800
Cash Equivalents | Level 1 | Money market funds |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Amortized Cost | 183,885 | 298,517
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 183,885 | 298,517
Cash Equivalents | Level 2 | Commercial paper |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Amortized Cost |  | 43,845
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | (9)
Estimated Fair Value |  | 43,836
Cash Equivalents | Level 2 | U.S. governmental securities |  |
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
Short-term Investments | Level 2 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Amortized Cost | 448,901 | 424,689
Gross Unrealized Gains | 535 | 264
Gross Unrealized Losses | (407) | (771)
Estimated Fair Value | 449,029 | 424,182
Short-term Investments | Level 2 | Commercial paper |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Amortized Cost | 31,367 | 42,958
Gross Unrealized Gains | 12 | 2
Gross Unrealized Losses | (8) | (25)
Estimated Fair Value | 31,371 | 42,935
Short-term Investments | Level 2 | Corporate notes and bonds |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Amortized Cost | 399,034 | 299,166
Gross Unrealized Gains | 522 | 262
Gross Unrealized Losses | (378) | (670)
Estimated Fair Value | 399,178 | 298,758
Short-term Investments | Level 2 | U.S. governmental securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Amortized Cost | 18,500 | 28,752
Gross Unrealized Gains | 1 | 0
Gross Unrealized Losses | (21) | (66)
Estimated Fair Value | $ 18,480 | $ 28,686

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 + Details
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