Financial Instruments - Cash Equivalents, Marketable Securities and Restricted Cash (Details) - USD ($) $ in Thousands	Aug. 01, 2021	Jan. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Fair Value	$ 944,285
Cash Equivalents	28,905	$ 54,780
Marketable securities	944,285	916,388
Restricted Cash	10,544	10,544
Amortized Cost	948,994	922,507
Total gross unrealized gains	5,353	9,255
Total gross unrealized losses	(62)	(34)
Total fair value	983,734	981,712
Level 1 \| Money market accounts
Debt Securities, Available-for-sale [Line Items]
Fair Value	29,449	49,984
Cash Equivalents	18,905	39,440
Marketable securities	0	0
Restricted Cash	10,544	10,544
Level 2 \| U.S. government treasury notes
Debt Securities, Available-for-sale [Line Items]
Total	341,033	339,253
Gross Unrealized Gains	1,842	3,241
Gross Unrealized Losses	(8)	(1)
Fair Value	342,867	342,493
Cash Equivalents	10,000	15,340
Marketable securities	332,867	327,153
Restricted Cash	0	0
Level 2 \| U.S. government agencies
Debt Securities, Available-for-sale [Line Items]
Total	54,741	56,729
Gross Unrealized Gains	322	516
Gross Unrealized Losses	0	0
Fair Value	55,063	57,245
Cash Equivalents	0	0
Marketable securities	55,063	57,245
Restricted Cash	0	0
Level 2 \| Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Total	465,168	425,115
Gross Unrealized Gains	2,535	4,176
Gross Unrealized Losses	(48)	(33)
Fair Value	467,655	429,258
Cash Equivalents	0	0
Marketable securities	467,655	429,258
Restricted Cash	0	0
Level 2 \| Foreign government bonds
Debt Securities, Available-for-sale [Line Items]
Total	17,281	21,486
Gross Unrealized Gains	177	307
Gross Unrealized Losses	0	0
Fair Value	17,458	21,793
Cash Equivalents	0	0
Marketable securities	17,458	21,793
Restricted Cash	0	0
Level 2 \| Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Total	68,331	79,924
Gross Unrealized Gains	477	1,015
Gross Unrealized Losses	(4)	0
Fair Value	68,804	80,939
Cash Equivalents	0	0
Marketable securities	68,804	80,939
Restricted Cash	0	$ 0
Level 2 \| Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Total	2,440
Gross Unrealized Gains	0
Gross Unrealized Losses	(2)
Fair Value	2,438
Cash Equivalents	0
Marketable securities	2,438
Restricted Cash	$ 0

Debt Securities, Available-for-sale, Cash Equivalents And Restricted Cash

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Debt Securities, Available-for-sale, Cash Equivalents And Restricted Cash, Accumulated Gross Unrealized Gain, Before Tax

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Debt Securities, Available-for-sale, Cash Equivalents And Restricted Cash, Accumulated Gross Unrealized Loss, Before Tax

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Debt Securities, Available-for-sale, Cash Equivalents And Restricted Cash, 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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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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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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Amortized cost excluding accrued interest, after allowance for credit loss, 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 excluding accrued interest, 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 excluding accrued interest, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), classified as current.

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Amount of cash and cash equivalents restricted as to withdrawal or usage, classified as noncurrent. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, 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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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