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Summary of Significant Accounting Policies (Property and Equipment) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Feb. 01, 2014
Feb. 02, 2013
Jan. 28, 2012
Property, Plant and Equipment [Line Items]      
Depreciation and amortization expense $ 13,469 $ 9,599 $ 7,071
Property and equipment, gross 114,378 90,570  
Less: Accumulated depreciation and amortization (43,997) (31,530)  
Property and equipment, net 70,381 59,040  
Furniture and fixtures [Member]
     
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 44,112 31,680  
Leasehold improvements [Member]
     
Property, Plant and Equipment [Line Items]      
Estimated useful lives 10 years    
Property and equipment, gross 51,736 41,671  
Computer and equipment [Member]
     
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 15,903 10,541  
Construction in process [Member]
     
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 2,627 $ 6,678  
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