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BENEFIT PLANS (Details) | 12 Months Ended |
--- | --- | ---
Aug. 01, 2020 USD ($) employee agreement | Aug. 03, 2019 USD ($) | Jul. 28, 2018 USD ($) | Feb. 01, 2020 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Number of union employees participating in multiemployer retirement plans under collective bargaining agreements | 60.00% |  |  |
Discount rate (as a percent) | 3.10% |  |  |
Defined benefit plan, accumulated other comprehensive income (loss), gain (loss), before tax | $ 1,500,000 |  |  |
Estimated actuarial loss | 800,000 |  |  |
Estimated amortization from accumulated other comprehensive gain into net periodic benefit cost | 2,700,000 |  |  |
Increase in accumulated postretirement benefit obligation | 800,000 |  |  |
Increase in service and interest cost | 100,000 |  |  |
Decrease in accumulated postretirement benefit obligation | 700,000 |  |  |
Decrease in service and interest cost | 100,000 |  |  |
Total employer contribution expenses | $ 21,000,000.0 | $ 21,000,000.0 | $ 11,600,000 |
Multiemployer pension plan withdrawal liability |  |  |  | $ 10,600,000
Number of multiemployer plans with accrued withdrawal liabilities included within other long-term liabilities | 7 | 7 |  |
Multiemployer Plan, Employer Contribution, Cost | $ 52,000,000 | $ 41,000,000 |  |
Number of employees | employee | 28,300 |  |  |
Employees covered by collective bargaining agreements | employee | 11,800 |  |  |
Number of collective bargaining agreements | agreement | 51 |  |  |
Number of collective bargaining agreements renegotiated | agreement | 2 |  |  |
Employees covered by renegotiated collective bargaining agreements | employee | 200 |  |  |
Number of collective bargaining agreements expired | agreement | 7 |  |  |
Employees covered by expired collective bargaining agreements | employee | 1,600 |  |  |
Number of collective bargaining agreements scheduled to expire | agreement | 19 |  |  |
Employees covered by collective bargaining agreements scheduled to expire | employee | 1,400 |  |  |
Minimum |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Discount rate (as a percent) | 1.74% | 2.99% |  |
Contributions to defined benefit pension plans and postretirement benefit plans | $ 0.0 |  |  |
Maximum |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Discount rate (as a percent) | 2.37% | 3.49% |  |
Contributions to defined benefit pension plans and postretirement benefit plans | $ 5,300,000 |  |  |
Other Postretirement Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Multiemployer pension plan withdrawal liability | 9,700,000 |  |  |
Multiemployer Plan, Employer Contribution, Cost | $ 52,300,000 | $ 41,300,000 | $ 500,000 |
Postemployment Retirement Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Health Care Cost Trend Rate Assumed, Next Fiscal Year | 7.80% |  |  |
Ultimate healthcare cost trend rate (as a percent) | 4.50% |  |  |
Defined Benefit Plan, Health Care Cost Trend Rate Assumed, Over Age 65 | 8.00% |  |  |
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate, Over Age 65 | 4.50% |  |  |
Multiemployer Plans, Health and Welfare Benefit | Other Postretirement Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Multiemployer Plan, Employer Contribution, Cost | $ 88,500,000 | 72,500,000 |  |
SUPERVALU |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Multiemployer pension plan withdrawal liability | $ 35,700,000 |  |  |
Multiemployer pension plan, payment period | 20 years |  |  |
Other long-term liabilities |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Multiemployer pension plan withdrawal liability | $ 51,600,000 | $ 43,200,000 |  |

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