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Summary of Significant Accounting Policies (Fair Value of Financial Instruments) (Details) - USD ($) $ in Thousands | Oct. 30, 2021 | Jan. 30, 2021 | Oct. 31, 2020
--- | --- | --- | ---
Significant Accounting Policies [Line Items] |  |  |
Amortized Cost | $ 224,563 | $ 140,928 | $ 96,749
Gross Unrealized Gains | 6 | 0 | 0
Gross Unrealized Losses | 93 | 60 | 50
Fair Market Value | 224,476 | 140,868 | 96,699
Fair Value, Inputs, Level 1 |  |  |
Significant Accounting Policies [Line Items] |  |  |
Cash equivalents | 60,800 | 250,700 | 104,700
Corporate bonds | Fair Value, Inputs, Level 2 |  |  |
Significant Accounting Policies [Line Items] |  |  |
Amortized Cost | 190,700 | 95,530 | 78,516
Gross Unrealized Gains | 6 | 0 | 0
Gross Unrealized Losses | 82 | 53 | 43
Fair Market Value | 190,624 | 95,477 | 78,473
Municipal bonds | Fair Value, Inputs, Level 2 |  |  |
Significant Accounting Policies [Line Items] |  |  |
Amortized Cost | 33,863 | 45,398 | 18,233
Gross Unrealized Gains | 0 | 0 | 0
Gross Unrealized Losses | 11 | 7 | 7
Fair Market Value | $ 33,852 | $ 45,391 | $ 18,226

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