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Summary of Significant Accounting Policies (Fair Value of Financial Instruments) (Details) - USD ($) $ in Thousands | Jan. 30, 2021 | Feb. 01, 2020
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Municipal Bonds [Member] |  |
Significant Accounting Policies [Line Items] |  |
Debt Securities, Held-to-maturity, Amortized Cost, before Other-than-temporary Impairment | $ 140,928 | $ 59,229
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 0 | 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 60 | 4
Debt Securities, Held-to-maturity, Fair Value | 140,868 | 59,225
Municipal Bonds [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Significant Accounting Policies [Line Items] |  |
Debt Securities, Held-to-maturity, Amortized Cost, before Other-than-temporary Impairment | 45,398 | 604
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 0 | 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 7 | 0
Debt Securities, Held-to-maturity, Fair Value | 45,391 | 604
Corporate Bond Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Significant Accounting Policies [Line Items] |  |
Debt Securities, Held-to-maturity, Amortized Cost, before Other-than-temporary Impairment | 95,530 | 58,625
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 0 | 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 53 | 4
Debt Securities, Held-to-maturity, Fair Value | $ 95,477 | $ 58,621

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- Definition Amount of accumulated unrecognized gain on investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27232-111563 + Details
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