Fair Value Measurement - Securities Carried at Amortized Cost Plus Accrued Interest (Details) - USD ($) $ in Thousands	Feb. 01, 2020	Feb. 02, 2019
Investment securities classified as held to maturity
Amortized Cost	$ 43,237	$ 59,233
Fair Market Value	43,242	59,184
Short-term Investments
Investment securities classified as held to maturity
Amortized Cost	27,562	50,350
Gross Unrealized Gains	8	4
Gross Unrealized Losses	(2)	(37)
Fair Market Value	27,568	50,317
Short-term Investments \| Obligations of the U.S. Treasury and U.S. government agencies \| Fair Value, Inputs, Level 1
Investment securities classified as held to maturity
Amortized Cost	17,277	38,706
Gross Unrealized Gains	8	4
Gross Unrealized Losses	(2)	(37)
Fair Market Value	17,283	38,673
Short-term Investments \| Obligations of states and municipalities \| Fair Value, Inputs, Level 2
Investment securities classified as held to maturity
Amortized Cost		95
Fair Market Value		95
Short-term Investments \| Bank certificates of deposit \| Fair Value, Inputs, Level 2
Investment securities classified as held to maturity
Amortized Cost	10,285	11,549
Fair Market Value	10,285	11,549
Long Term Investments
Investment securities classified as held to maturity
Amortized Cost	15,675	8,883
Gross Unrealized Losses	(1)	(16)
Fair Market Value	15,674	8,867
Long Term Investments \| Obligations of the U.S. Treasury and U.S. government agencies \| Fair Value, Inputs, Level 1
Investment securities classified as held to maturity
Amortized Cost	1,908	4,956
Gross Unrealized Losses	(1)	(16)
Fair Market Value	1,907	4,940
Long Term Investments \| Bank certificates of deposit \| Fair Value, Inputs, Level 2
Investment securities classified as held to maturity
Amortized Cost	13,767	3,927
Fair Market Value	$ 13,767	$ 3,927

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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118954083&loc=d3e26610-111562

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Topic 320
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-Section 50
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-Subparagraph (a)
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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
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-URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27232-111563

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Amount of accumulated unrealized loss 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
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-Section 50
-Paragraph 5
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-URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27232-111563

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Fair value of 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
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