Changes in Accumulated Other Comprehensive Income Components - (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2015	Nov. 01, 2014	Oct. 31, 2015	Nov. 01, 2014
ReclassificationAdjustmentOutOfAccumulatedOtherComprehensiveIncomeLineItems
Interest and Other Income		$ 8		$ 224
Income Tax Benefit (Expense)	$ 1,043	1,464	$ 27,310	28,743
Reclassified Accumulated Unrealized Gains and Losses
ReclassificationAdjustmentOutOfAccumulatedOtherComprehensiveIncomeLineItems
Interest and Other Income	(32)		$ 203
Income Tax Benefit (Expense)	$ (12)	$ 3		$ 84