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
	May 03, 2020	Apr. 30, 2019
Earnings Per Share [Abstract]
Net loss	$ (90,594)	$ (100,336)
Weighted-average shares used in computing net loss per share attributable to common stockholders, basic and diluted (in shares)	262,935	245,334
Net loss per share attributable to common stockholders, basic and diluted (in dollars per share)	$ (0.34)	$ (0.41)