Fair Value Measurements - Securities Carried at Amortized Cost Plus Accrued Interest (Details) - USD ($) $ in Thousands	Feb. 02, 2019	Feb. 03, 2018
Investment securities classified as held to maturity
Amortized Cost	$ 59,233	$ 56,951
Fair Market Value	59,184	56,809
Short-term Investments
Investment securities classified as held to maturity
Amortized Cost	50,350	31,500
Gross Unrealized Gains	4	1
Gross Unrealized Losses	(37)	(27)
Fair Market Value	50,317	31,474
Short-term Investments \| Obligations of the U.S. Treasury \| Fair Value, Inputs, Level 1
Investment securities classified as held to maturity
Amortized Cost	38,706
Gross Unrealized Gains	4
Gross Unrealized Losses	(37)
Fair Market Value	38,673
Short-term Investments \| Obligations of the U.S. Treasury \| Fair Value, Inputs, Level 2
Investment securities classified as held to maturity
Amortized Cost		10,162
Gross Unrealized Losses		(25)
Fair Market Value		10,137
Short-term Investments \| Obligations of states and municipalities \| Fair Value, Inputs, Level 2
Investment securities classified as held to maturity
Amortized Cost	95	8,111
Gross Unrealized Gains		1
Gross Unrealized Losses		(2)
Fair Market Value	95	8,110
Short-term Investments \| Bank certificates of deposit \| Fair Value, Inputs, Level 1
Investment securities classified as held to maturity
Amortized Cost		13,227
Fair Market Value		13,227
Short-term Investments \| Bank certificates of deposit \| Fair Value, Inputs, Level 2
Investment securities classified as held to maturity
Amortized Cost	11,549
Fair Market Value	11,549
Long Term Investments
Investment securities classified as held to maturity
Amortized Cost	8,883	25,451
Gross Unrealized Losses	(16)	(116)
Fair Market Value	8,867	25,335
Long Term Investments \| Obligations of the U.S. Treasury \| Fair Value, Inputs, Level 1
Investment securities classified as held to maturity
Amortized Cost	4,956	9,967
Gross Unrealized Losses	(16)	(116)
Fair Market Value	4,940	9,851
Long Term Investments \| Bank certificates of deposit \| Fair Value, Inputs, Level 2
Investment securities classified as held to maturity
Amortized Cost	3,927	15,484
Fair Market Value	$ 3,927	$ 15,484

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.1)
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.6)
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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