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Marketable Securities - Components of Marketable Securities (Details) - USD ($) $ in Thousands | Apr. 30, 2026 | Jan. 31, 2026
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Cost or Amortized Cost | $ 242,148 | $ 286,201
Gross Unrealized Gains | 383 | 1,379
Gross Unrealized Losses | (299) | 0
Total Estimated Fair Value | 242,232 | 287,580
U.S. government securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost or Amortized Cost | 157,809 | 188,270
Gross Unrealized Gains | 244 | 968
Gross Unrealized Losses | (128) | 0
Total Estimated Fair Value | 157,925 | 189,238
Debt Security, Government, Non-US [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost or Amortized Cost |  | 97,931
Gross Unrealized Gains |  | 411
Gross Unrealized Losses |  | 0
Total Estimated Fair Value |  | 98,342
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost or Amortized Cost | 84,339 |
Gross Unrealized Gains | 139 |
Gross Unrealized Losses | (171) |
Total Estimated Fair Value | $ 84,307 | $ 98,342

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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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- Definition Amount, before tax, of unrealized loss 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 (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 + Details
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