Cash Equivalents and Investments - Schedule of Cash and Cash Equivalents and Investments Fair Value (Details) - USD ($) $ in Thousands	Apr. 30, 2024	Jan. 31, 2024
Cash equivalents:
Amortized Cost	$ 1,006,372	$ 1,331,709
Gross Unrealized Gains	1	1
Gross Unrealized Losses	(21)	(2)
Estimated Fair Value	1,006,352	1,331,708
Investments:
Amortized Cost	3,141,551	3,005,041
Gross Unrealized Gains	1,091	2,958
Gross Unrealized Losses	(13,726)	(8,193)
Estimated Fair Value	3,128,916	2,999,806
Amortized Cost	4,147,923	4,336,750
Gross Unrealized Gains	1,092	2,959
Gross Unrealized Losses	(13,747)	(8,195)
Estimated Fair Value	4,135,268	4,331,514
Corporate notes and bonds
Investments:
Amortized Cost	1,496,420	1,549,151
Gross Unrealized Gains	901	1,959
Gross Unrealized Losses	(6,658)	(3,394)
Estimated Fair Value	1,490,663	1,547,716
U.S. government and agency securities
Investments:
Amortized Cost	785,243	877,496
Gross Unrealized Gains	0	574
Gross Unrealized Losses	(6,125)	(4,653)
Estimated Fair Value	779,118	873,417
Commercial paper
Investments:
Amortized Cost	528,809	353,525
Gross Unrealized Gains	37	154
Gross Unrealized Losses	(798)	(131)
Estimated Fair Value	528,048	353,548
Certificates of deposit
Investments:
Amortized Cost	331,079	224,869
Gross Unrealized Gains	153	271
Gross Unrealized Losses	(145)	(15)
Estimated Fair Value	331,087	225,125
Money market funds
Cash equivalents:
Amortized Cost	492,568	533,211
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	492,568	533,211
U.S. government securities
Cash equivalents:
Amortized Cost	367,494	742,235
Gross Unrealized Gains	0	1
Gross Unrealized Losses	(1)	(2)
Estimated Fair Value	367,493	742,234
Time deposits
Cash equivalents:
Amortized Cost	58,145	56,263
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	58,145	$ 56,263
Commercial paper
Cash equivalents:
Amortized Cost	53,742
Gross Unrealized Gains	0
Gross Unrealized Losses	(7)
Estimated Fair Value	53,735
Corporate notes and bonds
Cash equivalents:
Amortized Cost	34,423
Gross Unrealized Gains	1
Gross Unrealized Losses	(13)
Estimated Fair Value	$ 34,411

Cash Equivalents, Accumulated Gross Unrealized Gain, Before Tax

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Cash Equivalents And Debt Securities, Available-For-Sale, Accumulated Gross Unrealized Gains, Before Tax

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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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