Financial Instruments - Cash Equivalents, Marketable Securities and Restricted Cash (Details) - USD ($) $ in Thousands	May 03, 2020	Feb. 02, 2020
Debt Securities, Available-for-sale [Line Items]
Total	$ 914,577
Fair Value	926,560
Cash Equivalents	34,985	$ 14,069
Marketable securities	926,560	936,518
Restricted Cash	15,287	15,287
Amortized Cost	914,577	932,260
Total gross unrealized gains	12,492	7,263
Total gross unrealized losses	(509)	(4)
Total fair value	976,832	965,874
Level 1 \| Money market accounts
Debt Securities, Available-for-sale [Line Items]
Fair Value	50,272	26,355
Cash Equivalents	34,985	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	340,119	323,751
Gross Unrealized Gains	5,952	2,146
Gross Unrealized Losses	(1)	0
Fair Value	346,070	325,897
Cash Equivalents	0	0
Marketable securities	346,070	325,897
Restricted Cash	0	0
Level 2 \| U.S. government agencies
Debt Securities, Available-for-sale [Line Items]
Total	41,675	53,930
Gross Unrealized Gains	618	317
Gross Unrealized Losses	(11)	(3)
Fair Value	42,282	54,244
Cash Equivalents	0	0
Marketable securities	42,282	54,244
Restricted Cash	0	0
Level 2 \| Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Total	427,757	452,318
Gross Unrealized Gains	4,706	3,954
Gross Unrealized Losses	(412)	(1)
Fair Value	432,051	456,271
Cash Equivalents	0	3,001
Marketable securities	432,051	453,270
Restricted Cash	0	0
Level 2 \| Foreign government bonds
Debt Securities, Available-for-sale [Line Items]
Total	21,776	14,994
Gross Unrealized Gains	413	147
Gross Unrealized Losses	0	0
Fair Value	22,189	15,141
Cash Equivalents	0	0
Marketable securities	22,189	15,141
Restricted Cash	0	0
Level 2 \| Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Total	83,250	87,267
Gross Unrealized Gains	803	699
Gross Unrealized Losses	(85)	0
Fair Value	83,968	87,966
Cash Equivalents	0	0
Marketable securities	83,968	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, 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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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), 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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