Income Taxes Items Affecting Statutory Corporate Tax Rate (Details) - USD ($)	12 Months Ended
Jan. 28, 2017	Jan. 30, 2016	Jan. 31, 2015
Income Tax Disclosure [Abstract]
Provision at statutory rate	35.00%	35.00%	35.00%
Income Tax Reconciliation, State and Local Income Taxes	$ 0.024	$ 0.021	$ 0.013
Effective Income Tax Rate Reconciliation, Tax Credits	(0.90%)	(0.80%)	(0.60%)
Provision for income taxes	36.50%	36.30%	35.70%

Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 6.I)
-URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319

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