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SHARE-BASED AWARDS - Restricted Stock Awards (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Aug. 03, 2019
Jul. 28, 2018
Jul. 29, 2017
Number of Shares      
Supervalu replacement awards (in shares) 4,301,233    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]      
Supervalu replacement awards (in dollars per share) $ 32.50    
Restricted Stock and Restricted Stock Unit Awards      
Number of Shares      
Beginning balance (in shares) 1,344,602 1,270,111 733,797
Granted (in shares) 1,665,233 716,952 1,107,526
Vested (in shares) (2,038,290) (434,730) (420,098)
Forfeited (in shares) (852,045) (207,731) (151,114)
Ending balance (in shares) 4,420,733 1,344,602 1,270,111
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]      
Beginning balance (in dollars per share) $ 41.78 $ 44.56 $ 55.55
Granted (in dollars per share) 23.30 40.06 40.16
Vested (in dollars per share) 34.81 47.24 50.14
Forfeited (in dollars per share) 30.83 41.38 50.16
Beginning balance (in dollars per share) $ 31.11 $ 41.78 $ 44.56
Intrinsic value of restricted stock units vested $ 36,071 $ 12,420 $ 10,465