Cash Equivalents and Investments - Schedule of Cash and Cash Equivalents and Investments Fair Value (Details) - USD ($) $ in Thousands	Jul. 31, 2023	Jan. 31, 2023
Cash equivalents:
Amortized Cost	$ 458,729	$ 539,390
Gross Unrealized Gains	0	1
Gross Unrealized Losses	(4)	(2)
Estimated Fair Value	458,725	539,389
Investments:
Amortized Cost	4,127,811	4,176,983
Gross Unrealized Gains	702	2,753
Gross Unrealized Losses	(30,824)	(38,747)
Estimated Fair Value	4,097,689	4,140,989
Amortized Cost	4,586,540	4,716,373
Gross Unrealized Gains	702	2,754
Gross Unrealized Losses	(30,828)	(38,749)
Estimated Fair Value	4,556,414	4,680,378
Corporate notes and bonds
Investments:
Amortized Cost	1,760,591	2,124,454
Gross Unrealized Gains	620	2,096
Gross Unrealized Losses	(15,566)	(23,470)
Estimated Fair Value	1,745,645	2,103,080
U.S. government and agency securities
Investments:
Amortized Cost	1,259,084	715,949
Gross Unrealized Gains	23	107
Gross Unrealized Losses	(13,868)	(12,220)
Estimated Fair Value	1,245,239	703,836
Commercial paper
Investments:
Amortized Cost	793,135	883,023
Gross Unrealized Gains	6	272
Gross Unrealized Losses	(1,076)	(1,947)
Estimated Fair Value	792,065	881,348
Certificates of deposit
Investments:
Amortized Cost	315,001	453,557
Gross Unrealized Gains	53	278
Gross Unrealized Losses	(314)	(1,110)
Estimated Fair Value	314,740	452,725
Money market funds
Cash equivalents:
Amortized Cost	409,604	520,138
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	409,604	520,138
Money market funds \| Revision of Prior Period, Reclassification, Adjustment
Cash equivalents:
Estimated Fair Value		141,000
Corporate notes and bonds
Cash equivalents:
Amortized Cost	22,228	6,902
Gross Unrealized Gains	0	1
Gross Unrealized Losses	0	0
Estimated Fair Value	22,228	6,903
U.S. government securities
Cash equivalents:
Amortized Cost	15,993
Gross Unrealized Gains	0
Gross Unrealized Losses	(1)
Estimated Fair Value	15,992
Commercial paper
Cash equivalents:
Amortized Cost	10,904	9,305
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(3)	(1)
Estimated Fair Value	$ 10,901	9,304
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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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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