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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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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).

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