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BENEFIT PLANS - Narrative (Details) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jan. 30, 2021 USD ($) | Feb. 01, 2020 USD ($) | Jan. 30, 2021 USD ($) | Feb. 01, 2020 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined benefit plan, expected future employer contributions, current fiscal year | $ 5,300 |  | $ 5,300 |
Multiemployer pension plan, withdrawal liability |  | $ 10,600 |  | $ 10,600
Multiemployer pension plan, payment period |  | 1 year |  |
Remeasurement, effect on AOCI |  |  |  | $ (7,610)
SUPERVALU Retirement Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Lump sum settlement payments |  | $ 664,000 |  |
Non-cash pension settlement charge |  | 10,300 |  |
Remeasurement, effect on AOCI |  | $ 1,500 |  |
SUPERVALU Retirement Plan | Measurement Input, Discount Rate |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Measurement input |  | 0.031 |  | 0.031
Other Postretirement Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Multiemployer plan, contributions by employer | $ 11,800 | $ 12,600 | $ 23,700 | $ 26,100

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