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Fair Value Measurements - Schedule of Investments in Marketable Securities (Details) - USD ($) $ in Thousands | Jul. 31, 2025 | Jan. 31, 2025
--- | --- | ---
Current assets |  |
Amortized Cost | $ 290,282 | $ 281,484
Gross Unrealized Gains | 888 | 793
Gross Unrealized Losses | (96) | (121)
Estimated Fair Value | 291,074 | 282,156
U.S. Treasury securities |  |
Current assets |  |
Amortized Cost | 154,788 | 155,017
Gross Unrealized Gains | 424 | 254
Gross Unrealized Losses | (92) | (105)
Estimated Fair Value | 155,120 | 155,166
Commercial paper |  |
Current assets |  |
Amortized Cost | 3,983 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | 0 |
Estimated Fair Value | 3,983 |
Corporate bonds |  |
Current assets |  |
Amortized Cost | 101,520 | 105,532
Gross Unrealized Gains | 457 | 487
Gross Unrealized Losses | (4) | (10)
Estimated Fair Value | 101,973 | 106,009
U.S. agency bonds |  |
Current assets |  |
Amortized Cost | 29,991 | 20,935
Gross Unrealized Gains | 7 | 52
Gross Unrealized Losses | 0 | (6)
Estimated Fair Value | $ 29,998 | $ 20,981

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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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