Changes in Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2016	May. 02, 2015
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance Accumulated other comprehensive income, net of tax	$ 800
Other Comprehensive Income Loss Before Reclassifications Net Of Tax		$ (483)
Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax		151
Unrealized gain on available-for-sale securities, net of deferred income taxes	153	(332)
Ending Balance Accumulated other comprehensive income, net of tax	953
ChangeInUnrealizedGainsOnAvailableForSaleSecuritiesMember [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance Accumulated other comprehensive income, net of tax		786
Other Comprehensive Income Loss Before Reclassifications Net Of Tax	154
Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax	(1)
Unrealized gain on available-for-sale securities, net of deferred income taxes	$ 153	(332)
Ending Balance Accumulated other comprehensive income, net of tax		$ 454