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Debt - Additional Information (Details)
 3 Months Ended
Oct. 30, 2014
USD ($)
May 05, 2018
USD ($)
Note
Apr. 29, 2017
USD ($)
Feb. 03, 2018
USD ($)
Debt Instrument [Line Items]        
Unamortized debt issuance costs   $ 162,000   $ 190,000
Repayment of remaining outstanding balance of notes   680,000 $ 2,386,000  
Equipment financing notes        
Debt Instrument [Line Items]        
Repayment of remaining outstanding balance of notes   71,000,000    
Credit Facility        
Debt Instrument [Line Items]        
Line of credit facility, expiration date Oct. 29, 2019      
Line of credit facility, maximum borrowing capacity $ 125,000,000      
Line of credit facility, potential maximum borrowing capacity 50,000,000      
Line of credit facility, amount outstanding   59,100,000    
Unamortized debt issuance costs   200,000    
Line of credit facility, remaining borrowing capacity   32,700,000    
Line of credit facility, average monthly outstanding amount   60,800,000    
Line of credit facility, average unused excess availability   $ 30,400,000    
Debt instrument interest rate   10.00%    
Line of credit facility   $ 7,500,000    
Line of credit facility, interest rate description   Borrowings made pursuant to the Credit Facility bear interest at a rate equal to the base rate (determined as the highest of (a) Bank of America N.A.’s prime rate, (b) the Federal Funds rate plus 0.50% or (c) the annual ICE-LIBOR rate (“LIBOR”) for the respective interest period) plus a varying percentage, based on the Company’s borrowing base, of 0.50%-0.75% for prime-based borrowings and 1.50%-1.75% for LIBOR-based borrowings    
Unused line fee   0.25%    
Credit Facility | Federal Funds Rate        
Debt Instrument [Line Items]        
Line of credit facility, basis spread on variable rate   0.50%    
Credit Facility | Prime-based Borrowings        
Debt Instrument [Line Items]        
Line of credit facility interest rate   5.25%    
Credit Facility | LIBOR-based Borrowings        
Debt Instrument [Line Items]        
Line of credit facility, expiration date   May 08, 2018    
Line of credit facility, amount outstanding   $ 56,000,000    
Line of credit facility interest rate   3.25%    
Credit Facility | Minimum        
Debt Instrument [Line Items]        
Debt Instrument Consolidated Fixed Coverage Ratio   100.00%    
Credit Facility | Minimum | Prime-based Borrowings        
Debt Instrument [Line Items]        
Line of credit facility, basis spread on variable rate   0.50%    
Credit Facility | Minimum | LIBOR-based Borrowings        
Debt Instrument [Line Items]        
Line of credit facility, basis spread on variable rate   1.50%    
Credit Facility | Maximum | Prime-based Borrowings        
Debt Instrument [Line Items]        
Line of credit facility, basis spread on variable rate   0.75%    
Credit Facility | Maximum | LIBOR-based Borrowings        
Debt Instrument [Line Items]        
Line of credit facility, basis spread on variable rate   1.75%    
Credit Facility | Commercial and Standby Letters of Credit        
Debt Instrument [Line Items]        
Line of credit facility, maximum borrowing capacity 20,000,000      
Credit Facility | Swingline Loans        
Debt Instrument [Line Items]        
Line of credit facility, maximum borrowing capacity $ 15,000,000      
Credit Facility | Standby Letters of Credit        
Debt Instrument [Line Items]        
Letters of credit outstanding, amount   $ 3,600,000    
Credit Facility | Documentary Letters of Credit        
Debt Instrument [Line Items]        
Letters of credit outstanding, amount   $ 1,500,000    
Master Agreement        
Debt Instrument [Line Items]        
Number of notes entered, equipment financing | Note   12    
Notes maturity term   48 months    
Master Agreement | Banc of America Leasing & Capital, LLC        
Debt Instrument [Line Items]        
Aggregate amount of notes borrowed   $ 26,400,000    
Master Agreement | Minimum        
Debt Instrument [Line Items]        
Notes fixed interest rate   3.07%    
Master Agreement | Maximum        
Debt Instrument [Line Items]        
Notes fixed interest rate   3.50%    
Term Loan Facility        
Debt Instrument [Line Items]        
Line of credit facility, Initiation date   Oct. 30, 2014    
Term Loan Facility | Term loan, due 2019        
Debt Instrument [Line Items]        
Line of credit facility, basis spread on variable rate 6.50%      
Notes fixed interest rate 1.00%      
Secured term loan facility, face amount $ 15,000,000      
Secured term loan facility, effective date   Oct. 29, 2014    
Debt Instrument, Interest Rate Terms   Interest on the Term Loan Facility was at a rate per annum equal to the greater of (a) 1.00% and (b) the one month LIBOR rate, plus 6.50%.    
Debt Instrument, Payment Terms   Interest payments were payable on the first business day of each calendar month, and increased by 2% following the occurrence and during the continuance of an “event of default,” as defined in the Term Loan Facility    
Debt Instrument, Description of Variable Rate Basis   one month LIBOR rate    
Debt Instrument Interest Rate Increase Decrease Of Event Of Default 2.00%      
Secured term loan facility, frequency of payments   quarterly    
Secured term loan facility, date of first required payment   Jan. 01, 2015    
Secured term loan facility, periodic payment principal   $ 250,000