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Variable Interest Entity (Amounts Included in Condensed Consolidated Balance Sheets as Result of consolidation of SRV) (Details) - USD ($)
$ in Thousands
Oct. 29, 2017
Jan. 29, 2017
Oct. 30, 2016
Jan. 31, 2016
Variable Interest Entity [Line Items]        
Cash $ 958 $ 24,042 $ 173 $ 37,873
Other receivables 1,669 349    
Property and equipment, net 98,151 52,432    
Other assets, net 487 452    
Total assets 252,947 155,967    
Noncontrolling interest in VIE 3,202 2,609    
Total liabilities and shareholders' equity 252,947 155,967    
Variable Interest Entity, Primary Beneficiary [Member] | SRV [Member]        
Variable Interest Entity [Line Items]        
Cash 656 139    
Other receivables 20 9    
Property and equipment, net 4,102 3,248    
Other assets, net 14 5    
Total assets 4,792 3,401    
Other current liabilities 177 792    
Long-term debt 1,413      
Noncontrolling interest in VIE 3,202 2,609    
Total liabilities and shareholders' equity $ 4,792 $ 3,401