Marketable Securities - Investments in Marketable Securities (Details) - USD ($) $ in Thousands	May 02, 2020	Feb. 01, 2020	May 04, 2019
Financial Instruments And Marketable Securities [Line Items]
Marketable securities, Cost or Amortized Cost	$ 45,706	$ 69,487	$ 75,738
Marketable Securities, Gross Unrealized Holding Gains	275	293	215
Marketable securities, Estimated Fair Value	45,981	69,780	75,953
Commercial paper
Financial Instruments And Marketable Securities [Line Items]
Available-for-sale securities, Cost or Amortized Cost	34,698	54,463	49,361
Available-for-sale securities, Gross Unrealized Holding Gains	275	293	215
Available-for-sale securities, Estimated Fair Value	34,973	54,756	49,576
Fixed income securities
Financial Instruments And Marketable Securities [Line Items]
Held-to-maturity securities, Cost or Amortized Cost	11,008	15,024	26,377
Held-to-maturity securities, Gross Unrealized Holding Gains	0	0	0
Held-to-maturity securities, Estimated Fair Value	$ 11,008	$ 15,024	$ 26,377

Financial Instruments And Marketable Securities [Line Items]

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Marketable Securities, Accumulated Gross Unrealized Gain

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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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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 amortized cost (held-to-maturity).

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Amount of accumulated unrecognized gain on investment in debt security measured at amortized cost (held-to-maturity).

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Fair value of investment in debt security measured at amortized cost (held-to-maturity).

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Amount of investment in marketable security.

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