EMPLOYEE BENEFIT PLANS AND COLLECTIVE BARGAINING AGREEMENTS - Narrative (Details) $ in Millions						3 Months Ended		4 Months Ended	12 Months Ended
	Dec. 18, 2022 USD ($)	Aug. 08, 2022 USD ($)	Dec. 31, 2020 USD ($) union	Nov. 30, 2020 USD ($)	Jul. 01, 2020 USD ($) union	Feb. 26, 2022 USD ($)	Feb. 27, 2021 USD ($)	Jun. 18, 2022 USD ($)	Feb. 24, 2024 USD ($) plan employee	Feb. 25, 2023 USD ($)	Feb. 26, 2022 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, transferred											$ 203.5
Defined benefit pension obligation											$ 205.4
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Settlement Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]											Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax
Defined benefit plan gain (loss) due to settlement											$ 11.1
Employer contributions									$ 18.3	$ 27.3	29.8
Expected employer contribution next fiscal year									$ 85.0
Number of multiemployer plans | plan									27
Number of unions | union					9
Employer discretionary contribution amount in 401(k)									$ 83.0	89.3	75.5
Non-cash pre-tax charge							$ 607.2
Non-cash charge, net of tax							$ 449.4
Additional funding		$ 120.0
Amount paid									73.0	73.6
Accrued interest									$ 3.9	4.4
Number of company employees | employee									285,000
Number of participants in collective bargaining agreements | employee									200,000
Number of participants renegotiated | employee									32,500
Number of employee scheduled to expire in collective bargaining agreements | employee									28,500
Accrued retention bonus									$ 35.0	5.3
Merger Agreement
Defined Benefit Plan Disclosure [Line Items]
Aggregate retention program amount	$ 100.0
Merger Agreement | Last day on year granted
Defined Benefit Plan Disclosure [Line Items]
Award vesting rights, percentage	50.00%
Business combination termination, award vesting rights, percentage	50.00%
Merger Agreement | Next twelve months
Defined Benefit Plan Disclosure [Line Items]
Award vesting rights, percentage	50.00%
Payment period	6 months
Business combination termination, award vesting rights, percentage	50.00%
Pension
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan gain (loss) due to settlement									(0.3)	0.6	16.2
Fair value of plan assets						$ 1,662.3			1,443.7	1,407.3	1,662.3
Payable to intermediary agent									47.8	51.6
Employer contributions									16.4	25.8
Pension obligation						2,001.2			1,691.5	1,697.5	2,001.2
Contributions by company									545.5	546.5	523.7
Pension | Safeway Plan
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets									1,175.4
Pension | Shaw's Plan
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets									216.6
Pension | United Plan
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets									27.3
Pension | Safeway VAPP
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets									24.4
Other Post-Retirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan gain (loss) due to settlement									0.0	0.0	0.0
Fair value of plan assets						0.0			0.0	0.0	0.0
Employer contributions									1.9	1.5
Non-cash pre-tax charge										19.0
Pension obligation						19.0			12.0	12.4	19.0
Multiemployer Health and Welfare Plans
Defined Benefit Plan Disclosure [Line Items]
Contributions by company									$ 1,300.0	$ 1,300.0	1,200.0
Combined Plan
Defined Benefit Plan Disclosure [Line Items]
Required annual contribution			$ 23.2
Defined contribution plan, term (in years)			25 years
MAP And FELRA
Defined Benefit Plan Disclosure [Line Items]
Number of unions | union			2
Required annual contribution								$ 1,200.0
Defined contribution plan, term (in years)									10 years
MAP And FELRA | Minimum
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan, term (in years)									25 years
MAP And FELRA | Maximum
Defined Benefit Plan Disclosure [Line Items]
Employer discretionary contribution amount in 401(k)									$ 13.7
MAP And FELRA | Other Post-Retirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Non-cash pre-tax charge						106.3
Non-cash charge, net of tax						78.7
Pension obligation						$ 19.0					$ 19.0
Variable Annuity Pension Plan (VAPP)
Defined Benefit Plan Disclosure [Line Items]
Non-cash pre-tax charge				$ 285.7
Variable Annuity Pension Plan (VAPP) | Minimum
Defined Benefit Plan Disclosure [Line Items]
Transition reserve, amount paid					$ 8.0