Condensed Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended
	May 03, 2020	Apr. 30, 2019
Statement of Comprehensive Income [Abstract]
Net loss	$ (90,594)	$ (100,336)
Other comprehensive income net of tax:
Change in unrealized net gain on available-for-sale securities	4,724	1,627
Comprehensive loss	$ (85,870)	$ (98,709)