Changes in Accumulated Other Comprehensive Income Components - (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jul. 31, 2021	Aug. 01, 2020	Jul. 31, 2021	Aug. 01, 2020
ReclassificationAdjustmentOutOfAccumulatedOtherComprehensiveIncomeLineItems
Income Tax Benefit (Expense)	$ 4,561,000	$ (3,880,000)	$ 7,642,000	$ (12,994,000)
Reclassified Accumulated Unrealized Gains and Losses
ReclassificationAdjustmentOutOfAccumulatedOtherComprehensiveIncomeLineItems
Interest and Other Income	34,000	83,000	85,000	738,000
Income Tax Benefit (Expense)	$ 8,000	$ 19,000	$ 20,000	$ 171,000