CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	12 Months Ended
	Jan. 28, 2017	Jan. 30, 2016	Jan. 31, 2015
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 21,151	$ (811,400)	$ 435,346
Other comprehensive income (loss), net of tax:
Net change in unrealized gain (loss) on marketable securities	(145)	(4,424)	1,234
Net change in unrealized loss on auction rate securities	0	2,274	597
Net change in unrealized gain (loss) on cash flow hedges	963	1,047	(2,120)
Other comprehensive income (loss), net of tax	818	(1,103)	(289)
Comprehensive income (loss), net of tax	$ 21,969	$ (812,503)	$ 435,057