Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2015	Nov. 01, 2014	Oct. 31, 2015	Nov. 01, 2014
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (11,610)	$ 26,463	$ 23,037	$ 96,471
Other comprehensive income (loss):
Unrealized (losses) gains on marketable securities, net of taxes	12	(29)	(6)	(81)
Foreign currency translation adjustment, net of taxes	(31)	119	90	116
Comprehensive income (loss)	$ (11,629)	$ 26,553	$ 23,121	$ 96,506