Changes in Accumulated Other Comprehensive Income Components - (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Oct. 28, 2017	Oct. 29, 2016	Oct. 28, 2017	Oct. 29, 2016
ReclassificationAdjustmentOutOfAccumulatedOtherComprehensiveIncomeLineItems
Income Tax Benefit (Expense)	$ (2,830)	$ (4,886)	$ (252)	$ 11,513
Reclassified Accumulated Unrealized Gains and Losses
ReclassificationAdjustmentOutOfAccumulatedOtherComprehensiveIncomeLineItems
Interest and Other Income	(41)	(185)	(36)	(269)
Income Tax Benefit (Expense)	$ (15)	$ (69)	$ (13)	$ (101)

Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (a),(b)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Name:	us-gaap_IncomeTaxExpenseBenefit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration