Changes in Accumulated Other Comprehensive Income Components - (Details) - USD ($)	3 Months Ended		6 Months Ended
	Aug. 04, 2018	Jul. 29, 2017	Aug. 04, 2018	Jul. 29, 2017
ReclassificationAdjustmentOutOfAccumulatedOtherComprehensiveIncomeLineItems
Income Tax Benefit (Expense)	$ 1,021,000	$ (1,249,000)	$ 4,195,000	$ 2,578,000
Reclassified Accumulated Unrealized Gains and Losses
ReclassificationAdjustmentOutOfAccumulatedOtherComprehensiveIncomeLineItems
Interest and Other Income	71,000	10,000	70,000	5,000
Income Tax Benefit (Expense)	$ 17,000	$ 4,000	$ 17,000	$ 2,000