Cash Equivalents and Investments - Schedule of Cash and Cash Equivalents and Investments Fair Value (Details) - USD ($) $ in Thousands	Oct. 31, 2021	Jan. 31, 2021
Cash equivalents:
Amortized Cost	$ 721,875	$ 683,100
Gross Unrealized Gains	3	8
Gross Unrealized Losses	(1)	(7)
Estimated Fair Value	721,877	683,101
Investments:
Amortized Cost	4,170,904	4,252,732
Gross Unrealized Gains	330	1,060
Gross Unrealized Losses	(3,763)	(630)
Debt securities	4,167,471	4,253,162
Amortized Cost	4,892,779	4,935,832
Gross Unrealized Gains	333	1,068
Gross Unrealized Losses	(3,764)	(637)
Estimated Fair Value	4,889,348	4,936,263
Corporate notes and bonds
Investments:
Amortized Cost	2,512,863	2,287,006
Gross Unrealized Gains	192	628
Gross Unrealized Losses	(3,278)	(481)
Debt securities	2,509,777	2,287,153
Commercial paper
Investments:
Amortized Cost	1,066,027	711,389
Gross Unrealized Gains	82	85
Gross Unrealized Losses	(131)	(102)
Debt securities	1,065,978	711,372
U.S. government and agency securities
Investments:
Amortized Cost	391,632	1,016,059
Gross Unrealized Gains	25	250
Gross Unrealized Losses	(321)	(46)
Debt securities	391,336	1,016,263
Certificates of deposit
Investments:
Amortized Cost	200,382	238,278
Gross Unrealized Gains	31	97
Gross Unrealized Losses	(33)	(1)
Debt securities	200,380	238,374
Money market funds
Cash equivalents:
Amortized Cost	581,689	334,891
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	581,689	334,891
U.S. government and agency securities
Cash equivalents:
Amortized Cost	60,000	23,700
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	60,000	23,700
Commercial paper
Cash equivalents:
Amortized Cost	46,992	242,040
Gross Unrealized Gains	1	2
Gross Unrealized Losses	0	(5)
Estimated Fair Value	46,993	242,037
Certificates of deposit
Cash equivalents:
Amortized Cost	27,001	23,500
Gross Unrealized Gains	1	3
Gross Unrealized Losses	0	0
Estimated Fair Value	27,002	23,503
Corporate notes and bonds
Cash equivalents:
Amortized Cost	6,193	58,969
Gross Unrealized Gains	1	3
Gross Unrealized Losses	(1)	(2)
Estimated Fair Value	$ 6,193	$ 58,970

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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