Fair Value Measurements - Schedule of Cash Equivalents and Marketable Securities (Details) - USD ($) $ in Thousands	Apr. 30, 2026	Jan. 31, 2026
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Amortized Cost	$ 996,906	$ 1,019,566
Gross Unrealized Gains	1,220	904
Gross Unrealized Losses	(3,060)	(127)
Fair Value	995,066	1,020,343
Cash Equivalents	97,728	294,740
Marketable Securities	897,338	725,603
Level 1 \| Money market funds
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Amortized Cost	39,630	81,237
Gross Unrealized Gains	21	0
Gross Unrealized Losses	0	0
Fair Value	39,651	81,237
Cash Equivalents	39,651	79,103
Marketable Securities	0	2,134
Level 2 \| Commercial paper
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Amortized Cost	359,382	437,817
Gross Unrealized Gains	742	307
Gross Unrealized Losses	(131)	(2)
Fair Value	359,993	438,122
Cash Equivalents	58,077	93,817
Marketable Securities	301,916	344,305
Level 2 \| Corporate debt securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Amortized Cost	296,335	228,455
Gross Unrealized Gains	35	165
Gross Unrealized Losses	(1,204)	(31)
Fair Value	295,166	228,589
Cash Equivalents	0	0
Marketable Securities	295,166	228,588
Level 2 \| Asset-backed securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Amortized Cost	18,449	23,306
Gross Unrealized Gains	0	336
Gross Unrealized Losses	(336)	0
Fair Value	18,113	23,642
Cash Equivalents	0	0
Marketable Securities	18,113	23,642
Level 2 \| Government agency securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Amortized Cost	283,110	248,751
Gross Unrealized Gains	422	96
Gross Unrealized Losses	(1,389)	(94)
Fair Value	282,143	248,753
Cash Equivalents	0	121,820
Marketable Securities	$ 282,143	$ 126,934

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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Amount of investment in marketable security, classified as current.

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