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LONG-TERM DEBT (Details) - USD ($)
$ in Thousands
12 Months Ended
Jul. 28, 2018
Jul. 29, 2017
Jul. 30, 2016
Aug. 14, 2014
Long-term debt instrument        
Debt Issuance Costs, Noncurrent, Net $ 1,200 $ 1,500    
Repayments of Long-term Debt $ 12,128 11,546 $ 11,255  
Effective interest rate on debt 7.32%      
Long-term debt        
Long-term debt, including current installments $ 151,314      
Less: current installments 12,441 12,128    
Long-term debt, excluding current portion 137,709 149,863    
Aggregate maturities of long-term debt        
2018 12,441      
2019 12,816      
2020 93,203      
2021 3,552      
2022 4,066      
2024 and thereafter 25,236      
Long-term debt, including current installments 150,150 161,991    
Financing obligation, due monthly, and maturing in October 2028 at an effective interest rate of 7.32%        
Aggregate maturities of long-term debt        
Long-term debt, including current installments $ 29,118 30,368    
Capital lease, Providence, Rhode Island corporate headquarters, due monthly, and maturing in April 2025 at an effective interest rate of 12.05%        
Long-term debt instrument        
Debt Instrument, Interest Rate, Effective Percentage 12.05%      
Aggregate maturities of long-term debt        
Long-term debt, including current installments $ 12,196 13,074    
Existing Term Loan Agreement, due quarterly (1)        
Long-term debt instrument        
Debt and Capital Lease Obligations       $ 150,000
Repayments of Long-term Debt 2,500      
Initial applicable margin       1.75%
Aggregate maturities of long-term debt        
Long-term debt, including current installments 108,836 $ 118,549    
Real estate backed term loan (gross of debt issuance costs) [Domain]        
Aggregate maturities of long-term debt        
Long-term debt, including current installments 110,000      
Minimum | Existing Term Loan Agreement, due quarterly (1)        
Long-term debt instrument        
Proceeds from Issuance of Debt 10,000      
Maximum | Existing Term Loan Agreement, due quarterly (1)        
Long-term debt instrument        
Proceeds from Issuance of Debt $ 50,000      
Federal funds effective rate | Existing Term Loan Agreement, due quarterly (1)        
Long-term debt instrument        
Reference rate federal funds effective rate      
Spread on reference rate (as a percent) 0.50%      
One-month LIBOR | Existing Term Loan Agreement, due quarterly (1)        
Long-term debt instrument        
Reference rate one-month LIBOR      
Spread on reference rate (as a percent) 1.00%      
Nine month LIBOR | Existing Term Loan Agreement, due quarterly (1)        
Long-term debt instrument        
Initial applicable margin       0.75%
Debt Instrument, Variable Rate LIBOR | Existing Term Loan Agreement, due quarterly (1)        
Long-term debt instrument        
Reference rate one, two, three or six months or, if approved by all affected lenders, nine months