Summary of Significant Accounting Policies (Property and Equipment) (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 30, 2016	Jan. 31, 2015	Feb. 01, 2014
Property, Plant and Equipment [Line Items]
Depreciation and amortization expense	$ 22,227	$ 17,202	$ 13,469
Property and equipment, gross	194,179	146,383
Less: Accumulated depreciation and amortization	(74,395)	(59,385)
Property and equipment, net	119,784	86,998
Furniture and fixtures [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 81,418	54,933
Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives	10 years
Property and equipment, gross	$ 80,814	64,109
Computer and equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	28,358	20,017
Construction in process [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 3,589	$ 7,324
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