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