Cash Equivalents and Investments - Schedule of Cash and Cash Equivalents and Investments Fair Value (Details) - USD ($) $ in Thousands	Jan. 31, 2025	Jan. 31, 2024
Cash equivalents:
Amortized Cost	$ 2,251,048	$ 1,331,709
Gross Unrealized Gains	92	1
Gross Unrealized Losses	0	(2)
Estimated Fair Value	2,251,140	1,331,708
Investments:
Amortized Cost	2,664,694	3,005,041
Gross Unrealized Gains	2,944	2,958
Gross Unrealized Losses	(2,289)	(8,193)
Estimated Fair Value	2,665,349	2,999,806
Amortized Cost	4,915,742	4,336,750
Gross Unrealized Gains	3,036	2,959
Gross Unrealized Losses	(2,289)	(8,195)
Estimated Fair Value	4,916,489	4,331,514
Corporate notes and bonds
Investments:
Amortized Cost	1,559,893	1,549,151
Gross Unrealized Gains	2,177	1,959
Gross Unrealized Losses	(1,520)	(3,394)
Estimated Fair Value	1,560,550	1,547,716
U.S. government and agency securities
Investments:
Amortized Cost	609,937	877,496
Gross Unrealized Gains	528	574
Gross Unrealized Losses	(727)	(4,653)
Estimated Fair Value	609,738	873,417
Commercial paper
Investments:
Amortized Cost	307,752	353,525
Gross Unrealized Gains	142	154
Gross Unrealized Losses	(38)	(131)
Estimated Fair Value	307,856	353,548
Certificates of deposit
Investments:
Amortized Cost	187,112	224,869
Gross Unrealized Gains	97	271
Gross Unrealized Losses	(4)	(15)
Estimated Fair Value	187,205	225,125
Money market funds
Cash equivalents:
Amortized Cost	1,741,089	533,211
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	1,741,089	533,211
U.S. government securities
Cash equivalents:
Amortized Cost	388,578	742,235
Gross Unrealized Gains	92	1
Gross Unrealized Losses	0	(2)
Estimated Fair Value	388,670	742,234
Time deposits
Cash equivalents:
Amortized Cost	113,851	56,263
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	113,851	$ 56,263
Corporate notes and bonds
Cash equivalents:
Amortized Cost	4,466
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Estimated Fair Value	4,466
Commercial paper
Cash equivalents:
Amortized Cost	3,064
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Estimated Fair Value	$ 3,064

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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