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SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($)
 3 Months Ended 12 Months Ended
May 24, 2017
Apr. 28, 2018
Aug. 03, 2019
Jul. 28, 2018
Jul. 29, 2017
Oct. 06, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Decrease in accounts payable   $ 20,900,000 $ (40,149,000) $ 3,961,000 $ 82,772,000  
Inventory, LIFO reserve, increase to net income       $ 13,900,000    
Change in accounting estimate, increase to per diluted share (in dollars per share)       $ 0.27    
Inventory write-down     15,000,000      
Decrease to cash used in operating activities     $ 284,530,000 $ 109,038,000 273,331,000  
Original maturities of highly liquid investments     3 months      
Bank overdrafts     $ 236,900,000 $ 115,800,000    
LIFO inventory amount     $ 1,600,000,000      
Gain on investment $ 6,100,000          
Stock repurchase program, authorized amount           $ 200,000,000
Repurchase of common stock (in shares)     0 614,660    
Repurchase of common stock       $ 24,231,000    
Present value of claims, discount rate     1.90%      
Insurance liabilities     $ 6,600,000 1,300,000    
Due from insurance companies     11,100,000      
Continuing Operations            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
New accounting pronouncement or change in accounting principle, increase to net loss from continuing operations     $ 11,000,000      
Change in accounting policy, increase to diluted earnings per share (in dollars per share)     $ 0.21      
Change in Accounting for Book Overdrafts            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Decrease to cash used in operating activities       400,000 7,400,000  
Goodwill and Asset Impairment Charges            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Reclassifications     $ 11,200,000      
Restructuring, Acquisition and Integration Related Expenses            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Reclassifications     $ 5,000,000      
Closed Property Lease Liability | Minimum            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Closed property lease liabilities, term of contract     1 year      
Closed Property Lease Liability | Maximum            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Closed property lease liabilities, term of contract     12 years      
SUPERVALU            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Present value of claims, discount rate     3.00%      
Other Long-Term Liabilities            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Reclassifications     $ 7,400,000      
Shipping and Handling            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Shipping, handling and transportation costs     $ 1,298,900,000 $ 582,900,000 $ 517,200,000