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Summary of Significant Accounting Policies (Fair Value of Financial Instruments) (Details) - USD ($) $ in Thousands | Jul. 31, 2021 | Jan. 30, 2021 | Aug. 01, 2020
--- | --- | --- | ---
Significant Accounting Policies [Line Items] |  |  |
Amortized Cost | $ 286,929 | $ 140,928 | $ 41,670
Gross Unrealized Gains | 0 | 0 | 65
Gross Unrealized Losses | 55 | 60 | 0
Fair Market Value | 286,874 | 140,868 | 41,735
Other Long-term Investments |  |  |
Significant Accounting Policies [Line Items] |  |  |
Amortized Cost | 1,104 |  |
Gross Unrealized Gains | 1 |  |
Gross Unrealized Losses | 0 |  |
Fair Market Value | 1,105 |  |
Fair Value, Inputs, Level 1 |  |  |
Significant Accounting Policies [Line Items] |  |  |
Cash equivalents | 73,900 | 250,700 | 144,100
Corporate bonds | Fair Value, Inputs, Level 2 |  |  |
Significant Accounting Policies [Line Items] |  |  |
Amortized Cost | 234,909 | 95,530 | 41,670
Gross Unrealized Gains | 0 | 0 | 65
Gross Unrealized Losses | 49 | 53 | 0
Fair Market Value | 234,860 | 95,477 | $ 41,735
Municipal bonds | Fair Value, Inputs, Level 2 |  |  |
Significant Accounting Policies [Line Items] |  |  |
Amortized Cost | 52,020 | 45,398 |
Gross Unrealized Gains | 0 | 0 |
Gross Unrealized Losses | 6 | 7 |
Fair Market Value | 52,014 | $ 45,391 |
Municipal bonds | Fair Value, Inputs, Level 2 | Other Long-term Investments |  |  |
Significant Accounting Policies [Line Items] |  |  |
Amortized Cost | 1,104 |  |
Gross Unrealized Gains | 1 |  |
Gross Unrealized Losses | 0 |  |
Fair Market Value | $ 1,105 |  |

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