Changes in Accumulated Other Comprehensive Income Components - (Details) - USD ($)	3 Months Ended		9 Months Ended
	Oct. 31, 2020	Nov. 02, 2019	Oct. 31, 2020	Nov. 02, 2019
ReclassificationAdjustmentOutOfAccumulatedOtherComprehensiveIncomeLineItems
Income Tax Benefit (Expense)	$ (9,704,000)	$ 51,000	$ (22,698,000)	$ 6,501,000
Reclassified Accumulated Unrealized Gains and Losses
ReclassificationAdjustmentOutOfAccumulatedOtherComprehensiveIncomeLineItems
Interest and Other Income	89,000	183,000	827,000	234,000
Income Tax Benefit (Expense)	$ 21,000	$ 43,000	$ 191,000	$ 55,000