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Summary of Significant Accounting Policies (Fair Value of Financial Instruments) (Details) - USD ($) $ in Thousands	Aug. 03, 2019	Feb. 02, 2019	Aug. 04, 2018
Significant Accounting Policies [Line Items]
Amortized Cost	$ 90,325	$ 85,412	$ 131,441
Gross Unrealized Gains	8	0	0
Gross Unrealized Losses	0	65	227
Fair Market Value	90,333	85,347	131,214
Fair Value, Inputs, Level 1
Significant Accounting Policies [Line Items]
Cash equivalents	167,900	215,700	63,900
Corporate bonds | Fair Value, Inputs, Level 2
Significant Accounting Policies [Line Items]
Amortized Cost	89,018	83,128	125,027
Gross Unrealized Gains	7	0	0
Gross Unrealized Losses	0	63	222
Fair Market Value	89,025	83,065	124,805
Municipal bonds | Fair Value, Inputs, Level 2
Significant Accounting Policies [Line Items]
Amortized Cost	1,307	2,284	6,414
Gross Unrealized Gains	1	0	0
Gross Unrealized Losses	0	2	5
Fair Market Value	1,308	$ 2,282	6,409
Other Long-term Investments
Significant Accounting Policies [Line Items]
Amortized Cost	1,043		1,404
Gross Unrealized Gains	0		0
Gross Unrealized Losses	0		0
Fair Market Value	1,043		1,404
Other Long-term Investments | Corporate bonds | Fair Value, Inputs, Level 1
Significant Accounting Policies [Line Items]
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Other Long-term Investments | Corporate bonds | Fair Value, Inputs, Level 2
Significant Accounting Policies [Line Items]
Amortized Cost	1,043		1,404
Gross Unrealized Gains			0
Gross Unrealized Losses			0
Fair Market Value	$ 1,043		$ 1,404

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

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