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SHARE-BASED AWARDS (Details) $ / shares in Units, $ in Thousands |  | 2 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Oct. 22, 2018 $ / shares shares | Sep. 26, 2019 USD ($) | Jan. 26, 2019 USD ($) | Aug. 03, 2019 USD ($) Plan installment $ / shares shares | Jul. 28, 2018 USD ($) $ / shares shares | Jul. 29, 2017 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Total unrecognized compensation cost | $ |  |  |  | $ 51,000 |  |
Weighted-average period over which cost is recognized |  |  |  | 2 years |  |
Number of additional shares (up to, in shares) | 5,000,000 |  |  |  |  |
Shares of common stock issued (in shares) |  |  |  | 2,004,730 |  |
Average price (in dollars per share) | $ / shares |  |  |  | $ 12.00 |  |
Cash received | $ |  |  |  | $ 23,857 |  |
Fixed value of expensed replacement award liabilities (in dollars per share) | $ / shares |  |  |  | $ 32.50 |  |
Minimum years of service to company |  |  |  | 10 years |  |
Allocated share-based compensation expense | $ |  |  | $ 6,600 |  |  |
Equity Incentive Plan 2012 |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of shares authorized and available for grant (in shares) |  |  |  | 1,472,441 |  |
Number of installments for non-employee directors | installment |  |  |  | 2 |  |
Equity Incentive Plan 2004 Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of installments for employees | installment |  |  |  | 4 |  |
Supervalu Replacement Awards |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of installments for employees | installment |  |  |  | 3 |  |
Employee Stock Option |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of equity incentive plans | Plan |  |  |  | 3 |  |
Stock options granted (in shares) |  |  |  | 0 | 0 | 0
Aggregate intrinsic value | $ |  |  |  | $ 100 | $ 700 | $ 100
2019 Performance Share Units |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of performance share units granted (in shares) |  |  |  | 339,282 |  |
Number of additional shares (up to, in shares) |  |  |  | 339,282 |  |
Weighted-average grant-date fair value (in dollars per share) | $ / shares |  |  |  | $ 22.56 |  |
Performance share units forfeited (in shares) |  |  |  | 6,260 |  |
Performance share units outstanding (in shares) |  |  |  | 333,022 |  |
2018 Performance Share Units |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of performance share units granted (in shares) |  |  |  |  | 109,100 |
Number of additional shares (up to, in shares) |  |  |  |  | 109,100 |
Weighted-average grant-date fair value (in dollars per share) | $ / shares |  |  |  |  | $ 39.74 |
Performance share units outstanding (in shares) |  |  |  | 0 |  |
Number of performance share units vested (in shares) |  |  |  | 0 |  |
2017 Performance Share Units |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of performance share units granted (in shares) |  |  |  |  |  | 397,242
Number of additional shares (up to, in shares) |  |  |  |  |  | 221,242
Weighted-average grant-date fair value (in dollars per share) | $ / shares |  |  |  |  |  | $ 40.82
Performance share units outstanding (in shares) |  |  |  | 0 |  |
Number of performance share units vested (in shares) |  |  |  | 77,234 | 111,860 | 150,396
Intrinsic value of restricted stock units vested | $ |  |  |  | $ 700 | $ 3,600 | $ 5,700
SUPERVALU |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Total unrecognized compensation cost | $ |  |  |  | $ 22,500 |  |
Cash payment (in dollars per share) | $ / shares | $ 32.50 |  |  |  |  |
Subsequent Event |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Cash received subsequent to end of fiscal year | $ |  | $ 400 |  |  |  |

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