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Summary of Significant Accounting Policies (Fair Value of Financial Instruments) (Details) - USD ($) $ in Thousands | Jan. 28, 2023 | Jan. 29, 2022
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Corporate Bond Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Significant Accounting Policies [Line Items] |  |
Amortized Cost | $ 66,845 | $ 236,069
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 292 | 286
Fair Market Value | 66,553 | 235,783
Municipal Bonds [Member] |  |
Significant Accounting Policies [Line Items] |  |
Amortized Cost | 66,845 | 277,141
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 292 | 330
Fair Market Value | $ 66,553 | 276,811
Municipal Bonds [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Significant Accounting Policies [Line Items] |  |
Amortized Cost |  | 41,072
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | 44
Fair Market Value |  | 41,028
Other Long-term Investments [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Significant Accounting Policies [Line Items] |  |
Amortized Cost |  | 37,717
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | 199
Fair Market Value |  | 37,518
Corporate Bond Securities - Long Term [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Significant Accounting Policies [Line Items] |  |
Amortized Cost |  | 37,717
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | 199
Fair Market Value |  | $ 37,518

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