DESCRIPTION OF BUSINESS, BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue Recognition and Costs of Sales and Vendor Allowances (Details) - USD ($) $ in Millions		3 Months Ended						4 Months Ended		12 Months Ended
	Feb. 29, 2020	Feb. 27, 2021	Dec. 05, 2020	Sep. 12, 2020	Feb. 29, 2020	Nov. 30, 2019	Sep. 07, 2019	Jun. 20, 2020	Jun. 15, 2019	Feb. 27, 2021	Feb. 29, 2020	Feb. 23, 2019
Deferred Revenue Arrangement [Line Items]
Receivables, net	$ 525.3	$ 550.9			$ 525.3					$ 550.9	$ 525.3
Contract liability	52.2	98.1			52.2					98.1	52.2
Net sales and other revenue	1,100.0	15,772.3	$ 15,408.9	$ 15,757.6	15,436.8	$ 14,103.2	$ 14,176.7	$ 22,751.6	$ 18,738.4	69,690.4	62,455.1	$ 60,534.5
Reduction of inventory for Vendor Allowance	72.0	57.9			72.0					57.9	72.0
Advertising costs										385.1	405.6	422.3
Cooperative advertising allowances										72.7	91.9	101.3
Pharmacy
Deferred Revenue Arrangement [Line Items]
Receivables, net	$ 218.5	$ 262.5			$ 218.5					262.5	218.5
Net sales and other revenue										$ 5,195.8	$ 5,236.8	$ 4,986.6