Cash Equivalents and Investments - Schedule of Cash and Cash Equivalents and Investments Fair Value (Details) - USD ($) $ in Thousands	Jan. 31, 2024	Jan. 31, 2023
Cash equivalents:
Amortized Cost	$ 1,331,709	$ 539,390
Gross Unrealized Gains	1	1
Gross Unrealized Losses	(2)	(2)
Estimated Fair Value	1,331,708	539,389
Investments:
Amortized Cost	3,005,041	4,176,983
Gross Unrealized Gains	2,958	2,753
Gross Unrealized Losses	(8,193)	(38,747)
Estimated Fair Value	2,999,806	4,140,989
Amortized Cost	4,336,750	4,716,373
Gross Unrealized Gains	2,959	2,754
Gross Unrealized Losses	(8,195)	(38,749)
Estimated Fair Value	4,331,514	4,680,378
Corporate notes and bonds
Investments:
Amortized Cost	1,549,151	2,124,454
Gross Unrealized Gains	1,959	2,096
Gross Unrealized Losses	(3,394)	(23,470)
Estimated Fair Value	1,547,716	2,103,080
U.S. government and agency securities
Investments:
Amortized Cost	877,496	715,949
Gross Unrealized Gains	574	107
Gross Unrealized Losses	(4,653)	(12,220)
Estimated Fair Value	873,417	703,836
Commercial paper
Investments:
Amortized Cost	353,525	883,023
Gross Unrealized Gains	154	272
Gross Unrealized Losses	(131)	(1,947)
Estimated Fair Value	353,548	881,348
Certificates of deposit
Investments:
Amortized Cost	224,869	453,557
Gross Unrealized Gains	271	278
Gross Unrealized Losses	(15)	(1,110)
Estimated Fair Value	225,125	452,725
U.S. government securities
Cash equivalents:
Amortized Cost	742,235
Gross Unrealized Gains	1
Gross Unrealized Losses	(2)
Estimated Fair Value	742,234
Money market funds
Cash equivalents:
Amortized Cost	533,211	520,138
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	533,211	520,138
Money market funds \| Reclassification adjustment
Cash equivalents:
Estimated Fair Value		141,000
Time deposits
Cash equivalents:
Amortized Cost	56,263
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Estimated Fair Value	$ 56,263
Commercial paper
Cash equivalents:
Amortized Cost		9,305
Gross Unrealized Gains		0
Gross Unrealized Losses		(1)
Estimated Fair Value		9,304
Corporate notes and bonds
Cash equivalents:
Amortized Cost		6,902
Gross Unrealized Gains		1
Gross Unrealized Losses		0
Estimated Fair Value		6,903
Certificates of deposit
Cash equivalents:
Amortized Cost		3,045
Gross Unrealized Gains		0
Gross Unrealized Losses		(1)
Estimated Fair Value		$ 3,044

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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Cash Equivalents And Debt Securities, Available-For-Sale, Amortized Cost

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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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Amortized cost of 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 debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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