Property and Equipment, net - Summary of Property and Equipment, Net (Details) - USD ($) $ in Thousands	Feb. 02, 2020	Feb. 03, 2019
Property, Plant and Equipment [Line Items]
Property and equipment, gross		$ 134,144
Property, plant and equipment and finance lease right-of-use asset gross	$ 188,749
Accumulated depreciation and amortization	70,018
Accumulated depreciation and amortization		42,453
Property and equipment, net	118,731
Property and equipment, net	118,731	91,691
Furniture, fixtures and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	65,329	60,535
Computer equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	32,259	25,027
Internal-use software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	30,222	19,308
Accumulated depreciation and amortization	15,900	9,700
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	39,447	22,342
Finance lease assets
Property, Plant and Equipment [Line Items]
Finance lease assets	2,565
Finance lease assets
Property, Plant and Equipment [Line Items]
Property and equipment, gross		705
Construction in progress
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 18,927	$ 6,227