CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Feb. 02, 2020	Feb. 03, 2019	Jan. 28, 2018
Income Statement [Abstract]
Net sales	$ 4,846,743	$ 3,532,837	$ 2,104,287
Cost of goods sold	3,702,683	2,818,032	1,736,737
Gross profit	1,144,060	714,805	367,550
Operating expenses:
Selling, general and administrative	969,890	589,507	451,673
Advertising and marketing	426,896	393,064	253,728
Total operating expenses	1,396,786	982,571	705,401
Loss from operations	(252,726)	(267,766)	(337,851)
Interest income (expense), net	356	(124)	(206)
Loss before income tax provision	(252,370)	(267,890)	(338,057)
Income tax provision	0	0	0
Net loss	$ (252,370)	$ (267,890)	$ (338,057)
Net loss per share attributable to common Class A and Class B stockholders, basic and diluted (in dollars per share)	$ (0.63)	$ (0.68)	$ (2.67)
Weighted average common shares used in computing net loss per share attributable to common Class A and Class B stockholders, basic and diluted (in shares)	398,256	393,000	262,200