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LEASES (Details)
ft² in Millions
3 Months Ended 12 Months Ended
Oct. 26, 2018
USD ($)
Oct. 23, 2018
USD ($)
property
Jan. 26, 2019
USD ($)
Aug. 03, 2019
USD ($)
Jul. 28, 2018
USD ($)
Jul. 29, 2017
USD ($)
Apr. 27, 2019
USD ($)
Oct. 27, 2018
ft²
Sale Leaseback Transaction [Line Items]                
Sale leaseback transaction, gross proceeds $ 48,500,000 $ 101,000,000            
Number of distribution centers | property   8            
Gain or loss on sale of facilities             $ 0  
Closed store reserve charge       $ 153,539,000 $ 9,738,000 $ 6,864,000    
Facility Closing                
Sale Leaseback Transaction [Line Items]                
Closed store reserve charge       $ 22,536,000 $ 0 $ 0    
Shop 'n Save | Facility Closing                
Sale Leaseback Transaction [Line Items]                
Closed store reserve charge     $ 17,100,000          
New Distribution Facility                
Sale Leaseback Transaction [Line Items]                
Area of real estate property (in square feet) | ft²               1.2