Financial Instruments - Cash Equivalents, Marketable Securities and Restricted Cash (Details) - USD ($) $ in Thousands	Aug. 02, 2020	Feb. 02, 2020
Debt Securities, Available-for-sale [Line Items]
Total	$ 923,519
Fair Value	937,514
Cash Equivalents	30,994	$ 14,069
Marketable securities	937,514	936,518
Restricted Cash	15,287	15,287
Amortized Cost	923,519	932,260
Total gross unrealized gains	14,001	7,263
Total gross unrealized losses	(6)	(4)
Total fair value	983,795	965,874
Level 1 \| Money market accounts
Debt Securities, Available-for-sale [Line Items]
Fair Value	46,281	26,355
Cash Equivalents	30,994	11,068
Marketable securities	0	0
Restricted Cash	15,287	15,287
Level 2 \| U.S. government treasury notes
Debt Securities, Available-for-sale [Line Items]
Total	365,487	323,751
Gross Unrealized Gains	4,926	2,146
Gross Unrealized Losses	0	0
Fair Value	370,413	325,897
Cash Equivalents	0	0
Marketable securities	370,413	325,897
Restricted Cash	0	0
Level 2 \| U.S. government agencies
Debt Securities, Available-for-sale [Line Items]
Total	46,120	53,930
Gross Unrealized Gains	598	317
Gross Unrealized Losses	(4)	(3)
Fair Value	46,714	54,244
Cash Equivalents	0	0
Marketable securities	46,714	54,244
Restricted Cash	0	0
Level 2 \| Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Total	405,307	452,318
Gross Unrealized Gains	6,550	3,954
Gross Unrealized Losses	(2)	(1)
Fair Value	411,855	456,271
Cash Equivalents	0	3,001
Marketable securities	411,855	453,270
Restricted Cash	0	0
Level 2 \| Foreign government bonds
Debt Securities, Available-for-sale [Line Items]
Total	18,770	14,994
Gross Unrealized Gains	430	147
Gross Unrealized Losses	0	0
Fair Value	19,200	15,141
Cash Equivalents	0	0
Marketable securities	19,200	15,141
Restricted Cash	0	0
Level 2 \| Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Total	87,835	87,267
Gross Unrealized Gains	1,497	699
Gross Unrealized Losses	0	0
Fair Value	89,332	87,966
Cash Equivalents	0	0
Marketable securities	89,332	87,966
Restricted Cash	$ 0	$ 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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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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Amount 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 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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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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