Fair Value Measurement - Securities Carried at Amortized Cost Plus Accrued Interest (Details) - USD ($) $ in Thousands	Nov. 02, 2019	Feb. 02, 2019
Investment securities classified as held to maturity
Amortized Cost	$ 48,577	$ 59,233
Fair Market Value	48,595	59,184
Short-term Investments
Investment securities classified as held to maturity
Amortized Cost	32,305	50,350
Gross Unrealized Gains	23	4
Gross Unrealized Losses		(37)
Fair Market Value	32,328	50,317
Short-term Investments \| Obligations of the U.S. Treasury \| Fair Value, Inputs, Level 1
Investment securities classified as held to maturity
Amortized Cost	24,109	38,706
Gross Unrealized Gains	23	4
Gross Unrealized Losses		(37)
Fair Market Value	24,132	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	8,196	11,549
Fair Market Value	8,196	11,549
Long Term Investments
Investment securities classified as held to maturity
Amortized Cost	16,272	8,883
Gross Unrealized Losses	(5)	(16)
Fair Market Value	16,267	8,867
Long Term Investments \| Obligations of the U.S. Treasury \| Fair Value, Inputs, Level 1
Investment securities classified as held to maturity
Amortized Cost	1,908	4,956
Gross Unrealized Losses	(5)	(16)
Fair Market Value	1,903	4,940
Long Term Investments \| Bank certificates of deposit \| Fair Value, Inputs, Level 2
Investment securities classified as held to maturity
Amortized Cost	14,364	3,927
Fair Market Value	$ 14,364	$ 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)
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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
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-Section 50
-Paragraph 5
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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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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
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-Name Accounting Standards Codification
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