Changes in Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Oct. 31, 2015	Nov. 01, 2014	Aug. 02, 2014	Oct. 31, 2015	Nov. 01, 2014
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance Accumulated other comprehensive income, net of tax		$ 814		$ 786	$ 778
Other Comprehensive Income Loss Before Reclassifications Net Of Tax			$ (40)		141
Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax			5		(140)
Unrealized gain on available-for-sale securities, net of deferred income taxes	$ 207	(35)	(35)	(27)	1
Ending Balance Accumulated other comprehensive income, net of tax	759	$ 779	$ 814	759	$ 779
ChangeInUnrealizedGainsOnAvailableForSaleSecuritiesMember [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance Accumulated other comprehensive income, net of tax	552			786
Other Comprehensive Income Loss Before Reclassifications Net Of Tax	227			(154)
Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax	(20)			127
Unrealized gain on available-for-sale securities, net of deferred income taxes	207			(27)
Ending Balance Accumulated other comprehensive income, net of tax	$ 759			$ 759