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Marketable Securities - Components of Marketable Securities (Details) - USD ($) $ in Thousands | Jul. 31, 2024 | Jan. 31, 2024
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Cost or Amortized Cost | $ 424,202 | $ 408,060
Gross Unrealized Gains | 1,233 | 1,153
Gross Unrealized Losses | (535) | (1,315)
Total Estimated Fair Value | 424,900 | 407,898
U.S. government securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost or Amortized Cost | 314,133 | 319,343
Gross Unrealized Gains | 681 | 782
Gross Unrealized Losses | (491) | (1,168)
Total Estimated Fair Value | 314,323 | 318,957
Foreign securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost or Amortized Cost | 6,346 | 6,349
Gross Unrealized Gains | 19 | 31
Gross Unrealized Losses | (6) | (13)
Total Estimated Fair Value | 6,359 | 6,367
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost or Amortized Cost | 103,723 | 82,368
Gross Unrealized Gains | 533 | 340
Gross Unrealized Losses | (38) | (134)
Total Estimated Fair Value | $ 104,218 | $ 82,574

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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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