Net Loss per Share Attributable to Common Stockholders - Net Loss per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Aug. 02, 2020	Jul. 31, 2019	Aug. 02, 2020	Jul. 31, 2019
Earnings Per Share [Abstract]
Net loss	$ (64,967)	$ (66,018)	$ (155,561)	$ (166,354)
Weighted-average shares used in computing net loss per share attributable to common stockholders, basic and diluted (in shares)	264,799	251,298	263,867	248,336
Net loss per share attributable to common stockholders, basic and diluted (in dollars per share)	$ (0.25)	$ (0.26)	$ (0.59)	$ (0.67)