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Summary of Significant Accounting Policies (Property and Equipment) (Details) - USD ($)
$ in Thousands
12 Months Ended
Feb. 03, 2018
Jan. 28, 2017
Jan. 30, 2016
Property, Plant and Equipment [Line Items]      
Depreciation and amortization expense $ 33,241 $ 26,631 $ 22,227
Property and equipment, gross 308,028 238,576  
Less: Accumulated depreciation and amortization (127,679) (100,200)  
Property and equipment, net 180,349 138,376  
Furniture and fixtures [Member]      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 114,394 96,491  
Leasehold improvements [Member]      
Property, Plant and Equipment [Line Items]      
Estimated useful lives 10 years    
Property and equipment, gross $ 133,460 96,075  
Computer and equipment [Member]      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 44,923 36,159  
Construction in process [Member]      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 15,251 $ 9,851  
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