Marketable Securities - Investments in Marketable Securities (Details) - USD ($) $ in Thousands	Feb. 01, 2020	Feb. 02, 2019
Financial Instruments And Marketable Securities [Line Items]
Cost or Amortized Cost	$ 69,487	$ 75,617
Gross Unrealized Holding Gains	293	302
Estimated Fair Value	69,780	75,919
Commercial Paper
Financial Instruments And Marketable Securities [Line Items]
Cost or Amortized Cost	54,463	49,402
Gross Unrealized Holding Gains	293	302
Estimated Fair Value	54,756	49,704
Fixed income securities
Financial Instruments And Marketable Securities [Line Items]
Cost or Amortized Cost	15,024	26,215
Gross Unrealized Holding Gains	0	0
Estimated Fair Value	$ 15,024	$ 26,215

Financial Instruments And Marketable Securities [Line Items]

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- Definition

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).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563

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- Definition

Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563

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- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26610-111562

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (aa)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563

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