Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Jan. 28, 2017	Jan. 30, 2016	Jan. 31, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 91,229	$ 1,946	$ 64,641
Other comprehensive income (loss):
Unrealized losses on marketable securities, net of taxes	(39)	(21)	(73)
Foreign currency translation adjustment, net of taxes	(29)	(501)	523
Comprehensive income	$ 91,161	$ 1,424	$ 65,091