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Summary of Significant Accounting Policies (Fair Value of Financial Instruments) (Details) - USD ($) $ in Thousands	Nov. 02, 2019	Feb. 02, 2019	Nov. 03, 2018
Significant Accounting Policies [Line Items]
Amortized Cost	$ 54,072	$ 85,412	$ 85,029
Gross Unrealized Gains	48	0	0
Gross Unrealized Losses	0	65	201
Fair Market Value	54,120	85,347	84,828
Fair Value, Inputs, Level 1
Significant Accounting Policies [Line Items]
Cash equivalents	64,300	215,700	84,900
Corporate bonds | Fair Value, Inputs, Level 2
Significant Accounting Policies [Line Items]
Amortized Cost	53,996	83,128	82,710
Gross Unrealized Gains	48	0	0
Gross Unrealized Losses	0	63	194
Fair Market Value	54,044	83,065	82,516
Municipal bonds | Fair Value, Inputs, Level 2
Significant Accounting Policies [Line Items]
Amortized Cost	76	2,284	2,319
Gross Unrealized Gains	0	0	0
Gross Unrealized Losses	0	2	7
Fair Market Value	$ 76	$ 2,282	$ 2,312

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Significant Accounting Policies [Line Items]

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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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
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Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity).

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Amount, before other-than-temporary impairment (OTTI) accretion, of investment in debt securities measured at amortized cost (held-to-maturity).

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