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Summary of Significant Accounting Policies (Fair Value of Financial Instruments) (Details) - USD ($) $ in Thousands | Feb. 03, 2018 | Jan. 28, 2017
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Corporate Bond Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Significant Accounting Policies [Line Items] |  |
Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment | $ 117,373 | $ 46
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain | 0 | 0
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | 177 | 0
Held-to-maturity Securities, Fair Value | 117,196 | 45
Corporate Bond Securities [Member] | Other Long-term Investments [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Significant Accounting Policies [Line Items] |  |
Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment | 25,465 | 6
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain | 0 | 0
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | 170 | 0
Held-to-maturity Securities, Fair Value | 25,295 | 6
Municipal Bonds [Member] |  |
Significant Accounting Policies [Line Items] |  |
Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment | 131,958 | 78
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain | 0 | 0
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | 177 | 0
Held-to-maturity Securities, Fair Value | 131,781 | 78
Municipal Bonds [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Significant Accounting Policies [Line Items] |  |
Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment | 14,585 | 32
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain | 0 | 0
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | 0 | 0
Held-to-maturity Securities, Fair Value | 14,585 | 32
Municipal Bonds [Member] | Other Long-term Investments [Member] |  |
Significant Accounting Policies [Line Items] |  |
Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment | 27,702 | 11
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain | 0 | 0
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | 172 | 0
Held-to-maturity Securities, Fair Value | 27,530 | 11
Municipal Bonds [Member] | Other Long-term Investments [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Significant Accounting Policies [Line Items] |  |
Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment | 2,237 | 4
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain | 0 | 0
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | 2 | 0
Held-to-maturity Securities, Fair Value | $ 2,235 | $ 4

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- Definition Amount of accumulated unrealized gain on investments in debt securities classified as held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 + Details
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