Cash Equivalents and Investments - Schedule of Cash and Cash Equivalents and Investments Fair Value (Details) - USD ($) $ in Thousands	Jan. 31, 2022	Jan. 31, 2021
Cash equivalents:
Amortized Cost	$ 845,234	$ 683,100
Gross Unrealized Gains	1	8
Gross Unrealized Losses	(5)	(7)
Estimated Fair Value	845,230	683,101
Investments:
Amortized Cost	4,037,943	4,252,732
Gross Unrealized Gains	204	1,060
Gross Unrealized Losses	(15,576)	(630)
Estimated Fair Value	4,022,571	4,253,162
Amortized Cost	4,883,177	4,935,832
Gross Unrealized Gains	205	1,068
Gross Unrealized Losses	(15,581)	(637)
Estimated Fair Value	4,867,801	4,936,263
Commercial paper
Investments:
Amortized Cost	884,376	711,389
Gross Unrealized Gains	81	85
Gross Unrealized Losses	(821)	(102)
Estimated Fair Value	883,636	711,372
Corporate notes and bonds
Investments:
Amortized Cost	2,610,010	2,287,006
Gross Unrealized Gains	91	628
Gross Unrealized Losses	(12,062)	(481)
Estimated Fair Value	2,598,039	2,287,153
U.S. government and agency securities
Investments:
Amortized Cost	439,449	1,016,059
Gross Unrealized Gains	28	250
Gross Unrealized Losses	(2,558)	(46)
Estimated Fair Value	436,919	1,016,263
Certificates of deposit
Investments:
Amortized Cost	104,108	238,278
Gross Unrealized Gains	4	97
Gross Unrealized Losses	(135)	(1)
Estimated Fair Value	103,977	238,374
Money market funds
Cash equivalents:
Amortized Cost	722,492	334,891
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	722,492	334,891
Commercial paper
Cash equivalents:
Amortized Cost	77,795	242,040
Gross Unrealized Gains	1	2
Gross Unrealized Losses	(2)	(5)
Estimated Fair Value	77,794	242,037
U.S. government and agency securities
Cash equivalents:
Amortized Cost	36,997	23,700
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(2)	0
Estimated Fair Value	36,995	23,700
Corporate notes and bonds
Cash equivalents:
Amortized Cost	7,950	58,969
Gross Unrealized Gains	0	3
Gross Unrealized Losses	(1)	(2)
Estimated Fair Value	$ 7,949	58,970
Certificates of deposit
Cash equivalents:
Amortized Cost		23,500
Gross Unrealized Gains		3
Gross Unrealized Losses		0
Estimated Fair Value		$ 23,503

Cash Equivalents, Accumulated Gross Unrealized Gain, 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 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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