Cash Equivalents and Investments - Schedule of Cash and Cash Equivalents and Investments Fair Value (Details) - USD ($) $ in Thousands	Jul. 31, 2022	Jan. 31, 2022
Cash equivalents:
Amortized Cost	$ 678,199	$ 845,234
Gross Unrealized Gains	0	1
Gross Unrealized Losses	(21)	(5)
Estimated Fair Value	678,178	845,230
Investments:
Amortized Cost	4,177,037	4,037,943
Gross Unrealized Gains	684	204
Gross Unrealized Losses	(44,560)	(15,576)
Estimated Fair Value	4,133,161	4,022,571
Amortized Cost	4,855,236	4,883,177
Gross Unrealized Gains	684	205
Gross Unrealized Losses	(44,581)	(15,581)
Estimated Fair Value	4,811,339	4,867,801
Commercial paper
Investments:
Amortized Cost	893,431	884,376
Gross Unrealized Gains	224	81
Gross Unrealized Losses	(3,852)	(821)
Estimated Fair Value	889,803	883,636
Corporate notes and bonds
Investments:
Amortized Cost	2,464,401	2,610,010
Gross Unrealized Gains	97	91
Gross Unrealized Losses	(30,226)	(12,062)
Estimated Fair Value	2,434,272	2,598,039
U.S. government and agency securities
Investments:
Amortized Cost	528,941	439,449
Gross Unrealized Gains	304	28
Gross Unrealized Losses	(9,640)	(2,558)
Estimated Fair Value	519,605	436,919
Certificates of deposit
Investments:
Amortized Cost	290,264	104,108
Gross Unrealized Gains	59	4
Gross Unrealized Losses	(842)	(135)
Estimated Fair Value	289,481	103,977
Money market funds
Cash equivalents:
Amortized Cost	590,661	722,492
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	590,661	722,492
Commercial paper
Cash equivalents:
Amortized Cost	71,835	77,795
Gross Unrealized Gains	0	1
Gross Unrealized Losses	(14)	(2)
Estimated Fair Value	71,821	77,794
U.S. government and agency securities
Cash equivalents:
Amortized Cost		36,997
Gross Unrealized Gains		0
Gross Unrealized Losses		(2)
Estimated Fair Value		36,995
Corporate notes and bonds
Cash equivalents:
Amortized Cost	15,703	7,950
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(7)	(1)
Estimated Fair Value	$ 15,696	$ 7,949

Cash Equivalents, Accumulated Gross Unrealized Gain, Before Tax

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Cash Equivalents, Accumulated Gross Unrealized Loss, 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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Amount, before tax, of unrealized loss 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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Amount of 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. Excludes cash and cash equivalents within disposal group and discontinued operation.

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