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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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- Definition Amount of accumulated unrecognized gain on investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 + Details
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