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Net Loss per Share - Schedule of Basic and Diluted Net Loss per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Feb. 02, 2020	Feb. 03, 2019	Jan. 28, 2018
Numerator:
Net loss	$ (252,370)	$ (267,890)	$ (338,057)
Accretion of convertible redeemable preferred stock	0	0	(361,520)
Net loss attributable to common stockholders	$ (252,370)	$ (267,890)	$ (699,577)
Denominator:
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
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)
Series A voting preferred stock
Denominator:
Antidilutive securities (in shares)			187,370
Series A-1 voting preferred stock
Denominator:
Antidilutive securities (in shares)			27,273
Series B voting preferred stock
Denominator:
Antidilutive securities (in shares)			116,324
Series C voting preferred stock
Denominator:
Antidilutive securities (in shares)			114,461
Series D convertible redeemable preferred stock
Denominator:
Antidilutive securities (in shares)			103,534
Series E convertible redeemable preferred stock
Denominator:
Antidilutive securities (in shares)			79,290
Series F convertible redeemable preferred stock
Denominator:
Antidilutive securities (in shares)			67,397
Series 1 Preferred Stock
Denominator:
Antidilutive securities (in shares)			60,000
Restricted stock
Denominator:
Antidilutive securities (in shares)			18,038
Stock options
Denominator:
Antidilutive securities (in shares)			77,885