Net Loss per Share Attributable to Common Stockholders - Summary of Computation of Basic and Diluted Net Loss per Share Attributable to Common Stockholders (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Feb. 02, 2020	Jan. 31, 2019		Jan. 31, 2018	[1]
Earnings Per Share [Abstract]
Net loss	$ (200,987)	$ (178,362)		$ (159,878)
Weighted-average shares used in computing net loss per share attributable to common stockholders, basic and diluted (in shares)	252,820	232,042	[1]	211,609
Net loss per share attributable to common stockholders, basic and diluted (in dollars per share)	$ (0.79)	$ (0.77)	[1]	$ (0.76)

[1]