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Summary of Significant Accounting Policies (Fair Value of Financial Instruments) (Details) - USD ($) $ in Thousands	Jul. 30, 2016	Jan. 30, 2016	Aug. 01, 2015
Fair Value, Inputs, Level 1 [Member]
Significant Accounting Policies [Line Items]
Cash equivalents	$ 42,400	$ 22,600	$ 40,400
Corporate Bond Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Significant Accounting Policies [Line Items]
Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment	6,390	37,127
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	0	0
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	7	29
Held-to-maturity Securities, Fair Value	6,383	37,098
Certificates of Deposit [Member] | Fair Value, Inputs, Level 2 [Member]
Significant Accounting Policies [Line Items]
Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment		6,916
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain		6
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss		0
Held-to-maturity Securities, Fair Value		6,923
Municipal Bonds [Member]
Significant Accounting Policies [Line Items]
Held-to-maturity Securities, Amortized Cost before Other than Temporary Impairment	28,933	46,335
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	4	6
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	7	29
Held-to-maturity Securities, Fair Value	28,930	46,312
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	22,543	2,291
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	4	0
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	0	0
Held-to-maturity Securities, Fair Value	$ 22,547	$ 2,291

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Cash Equivalents

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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=27724398&loc=d3e27232-111563

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Amount of accumulated unrealized loss 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 (c)
-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563

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Amount before other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity.

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Fair value of 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 (aa)
-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
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-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563

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