Condensed Consolidated Statements Of Comprehensive Income (Loss) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Nov. 01, 2014	Nov. 02, 2013	Nov. 01, 2014	Nov. 02, 2013
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 26,463	$ (28,479)	$ 96,471	$ 66,231
Other comprehensive income (loss):
Unrealized gains (losses) on marketable securities, net of taxes	(29)	70	(81)	(81)
Foreign currency translation adjustment, net of taxes	119	10	116	10
Comprehensive income (loss)	$ 26,553	$ (28,399)	$ 96,506	$ 66,160