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Summary of Significant Accounting Policies (Fair Value of Financial Instruments) (Details) - USD ($) $ in Thousands	Jan. 28, 2023	Jan. 29, 2022
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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Significant Accounting Policies [Line Items]

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Amount of accumulated unrecognized gain on investment in debt security measured at amortized cost (held-to-maturity).

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
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Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity).

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-Publisher FASB
-Name Accounting Standards Codification
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Amount, before other-than-temporary impairment (OTTI) accretion, of investment in debt securities measured at amortized cost (held-to-maturity).

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Fair value of investment in debt security measured at amortized cost (held-to-maturity).

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-Name Accounting Standards Codification
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