Marketable Securities - Schedule of Marketable Securities (Details) - USD ($) $ in Thousands	Apr. 30, 2026	Jan. 31, 2026
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 784,326	$ 817,975
Gross Unrealized Gains	0	346
Gross Unrealized Losses	(775)	(2)
Estimated Fair Value	783,551	818,319
Cash and cash equivalents, amortized cost	632,195	871,157
Cash and cash equivalents, fair value	175,041	301,640
Treasury bills
Debt Securities, Available-for-sale [Line Items]
Cash and cash equivalents, amortized cost	32,000	22,000
Cash and cash equivalents, fair value	31,957	21,982
Treasury bills and U.S. government securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	608,268	619,831
Gross Unrealized Gains	0	324
Gross Unrealized Losses	(581)	0
Estimated Fair Value	607,687	620,155
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	138,445	160,872
Gross Unrealized Gains	0	5
Gross Unrealized Losses	(176)	0
Estimated Fair Value	138,269	160,877
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	34,704	34,373
Gross Unrealized Gains	0	17
Gross Unrealized Losses	(12)	0
Estimated Fair Value	34,692	34,390
Yankee bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,909	2,899
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(6)	(2)
Estimated Fair Value	$ 2,903	$ 2,897

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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