Summary of Significant Accounting Policies (Property and Equipment) (Details) - USD ($) $ in Thousands	12 Months Ended
	Feb. 01, 2020	Feb. 02, 2019	Feb. 03, 2018
Property, Plant and Equipment [Line Items]
Depreciation and amortization expense	$ 54,979	$ 41,451	$ 33,241
Property and equipment, gross	654,157	469,885
Less: Accumulated depreciation and amortization	(215,071)	(168,588)
Property and equipment, net	439,086	301,297
Land [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	14,773	7,150
Furniture and fixtures [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 202,340	145,254
Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives	10 years
Property and equipment, gross	$ 240,664	166,374
Computer and equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	117,803	69,739
Construction in process [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 78,577	$ 81,368
Minimum [Member] | Furniture and fixtures [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives	3 years
Maximum [Member] | Furniture and fixtures [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives	10 years