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LONG-TERM DEBT (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jan. 27, 2018
Jan. 28, 2017
Jan. 27, 2018
Jan. 28, 2017
Jul. 29, 2017
Aug. 14, 2014
Long-term debt instrument            
Repayments of Long-term Debt     $ 6,054 $ 5,658    
Long term debt, including current portion, carrying value $ 156,118   156,118   $ 161,991  
Interest expense 4,233 $ 4,441 7,900 8,963    
Term loan            
Long-term debt instrument            
Repayments of Long-term Debt     2,500      
Long term debt, including current portion, carrying value 113,700   113,700      
Capital lease obligation            
Long-term debt instrument            
Interest Expense, Lessee, Assets under Capital Lease $ 400 400 $ 800 800    
Lease Term     10 years      
Effective interest rate on debt 12.05%   12.05%      
Capital Lease Obligation $ 12,700   $ 12,700      
Sale Leaseback Financing Obligation            
Long-term debt instrument            
Long term debt, including current portion, carrying value $ 29,800   $ 29,800      
Effective interest rate on debt 7.32%   7.32%      
Interest expense $ 500 $ 600 $ 1,100 $ 1,100    
Base Rate [Member] | Term loan            
Long-term debt instrument            
initial applicable margin     0.75%      
Federal Funds Effective Swap Rate [Member] | Term loan            
Long-term debt instrument            
Debt Instrument, Description of Variable Rate Basis     overnight federal funds effective rate      
Debt Instrument, Basis Spread on Variable Rate     0.50%      
One-month LIBOR | Term loan            
Long-term debt instrument            
Debt Instrument, Description of Variable Rate Basis     one-month LIBOR      
Debt Instrument, Basis Spread on Variable Rate     1.00%      
LIBOR | Term loan            
Long-term debt instrument            
Debt Instrument, Description of Variable Rate Basis     one, two, three or six months or, if approved by all affected lenders, nine months      
initial applicable margin     1.75%      
Term loan            
Long-term debt instrument            
Proceeds from borrowings of long-term debt           $ 150,000
Term loan | Minimum            
Long-term debt instrument            
Proceeds from Issuance of Debt     $ 10,000      
Term loan | Maximum            
Long-term debt instrument            
Proceeds from Issuance of Debt     $ 50,000