Stockholders' Deficit and Convertible Redeemable Preferred Stock - Schedule of Preferred Stock (Details) $ in Thousands	12 Months Ended
	Jan. 28, 2018 USD ($)
Temporary Equity [Line Items]
Accretion of convertible redeemable preferred stock	$ 361,520
Series A voting preferred stock
Temporary Equity [Line Items]
Accretion of convertible redeemable preferred stock	108,880
Series A-1 voting preferred stock
Temporary Equity [Line Items]
Accretion of convertible redeemable preferred stock	15,848
Series B voting preferred stock
Temporary Equity [Line Items]
Accretion of convertible redeemable preferred stock	67,595
Series C voting preferred stock
Temporary Equity [Line Items]
Accretion of convertible redeemable preferred stock	66,513
Series D voting preferred stock
Temporary Equity [Line Items]
Accretion of convertible redeemable preferred stock	60,163
Series E voting preferred stock
Temporary Equity [Line Items]
Accretion of convertible redeemable preferred stock	$ 42,521