Changes in Accumulated Other Comprehensive Income Components - (Details) - USD ($)	3 Months Ended		9 Months Ended
	Nov. 03, 2018	Oct. 28, 2017	Nov. 03, 2018	Oct. 28, 2017
ReclassificationAdjustmentOutOfAccumulatedOtherComprehensiveIncomeLineItems
Income Tax Benefit (Expense)	$ (1,287,000)	$ (2,830,000)	$ 2,907,000	$ (252,000)
Reclassified Accumulated Unrealized Gains and Losses
ReclassificationAdjustmentOutOfAccumulatedOtherComprehensiveIncomeLineItems
Interest and Other Income	0	(41,000)	70,000	(36,000)
Income Tax Benefit (Expense)	$ 0	$ (15,000)	$ 17,000	$ (13,000)