Condensed Consolidated Statements Of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Aug. 02, 2014	Aug. 03, 2013	Aug. 02, 2014	Aug. 03, 2013
Statement of Comprehensive Income [Abstract]
Net income	$ 30,126	$ 43,588	$ 70,008	$ 94,710
Other comprehensive income (loss):
Unrealized losses on marketable securities, net of taxes	(24)	(88)	(52)	(151)
Foreign currency translation adjustment, net of taxes	6	0	(3)	0
Comprehensive income	$ 30,108	$ 43,500	$ 69,953	$ 94,559