Changes in Accumulated Other Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Aug. 03, 2013	Jul. 28, 2012	Aug. 03, 2013	Jul. 28, 2012
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance Accumulated other comprehensive income, net of tax			$ 821
Unrealized gain on available-for-sale securities, net of deferred income taxes	(453)	13	(342)	73
Ending Balance Accumulated other comprehensive income, net of tax	479	1,009	479	1,009
ChangeInUnrealizedGainsOnAvailableForSaleSecuritiesMember [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance Accumulated other comprehensive income, net of tax	932		821
Other Comprehensive Income Loss Before Reclassifications Net Of Tax	(436)		(283)
Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax	(17)		(59)
Unrealized gain on available-for-sale securities, net of deferred income taxes	(453)		(342)
Ending Balance Accumulated other comprehensive income, net of tax	$ 479		$ 479