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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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