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Revolving Line Of Credit (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jul. 24, 2017
Oct. 28, 2017
Oct. 29, 2016
Oct. 28, 2017
Oct. 29, 2016
Jan. 28, 2017
Wells Fargo Senior Secured Revolving Credit Facility            
Line Of Credit Facility [Line Items]            
Increase line of credit facility, maximum borrowing capacity $ 15,000          
Line of credit facility, maximum borrowing capacity $ 150,000          
Line of credit facility, amount outstanding   $ 87,255   $ 87,255   $ 67,110
Amounts in depository under lock-box arrangements   8,801   $ 8,801   6,138
Revolving credit facility, covenant term       The Revolving Line of Credit also requires us to maintain a minimum availability at all times of not less than 10% of the gross borrowing base, and in any event, not less than $5,000    
Line of credit , maturity date       Dec. 03, 2020    
Deferred financing fees outstanding   419   $ 419   $ 295
Amortization of deferred financing fees   26 $ 40 $ 106 $ 124  
Wells Fargo Senior Secured Revolving Credit Facility | Minimum            
Line Of Credit Facility [Line Items]            
Line of credit facility gross borrowing base percentage       10.00%    
Line of credit facility available borrowing capacity   5,000   $ 5,000    
Wells Fargo Stand-by Commercial Letters of Credit            
Line Of Credit Facility [Line Items]            
Net borrowing available under revolving line of credit   $ 1,200   $ 1,200