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. 29, 2020	Nov. 30, 2019	Sep. 07, 2019	Feb. 23, 2019	Dec. 01, 2018	Sep. 08, 2018	Jun. 15, 2019	Jun. 16, 2018	Feb. 29, 2020	Feb. 23, 2019	Feb. 24, 2018
Deferred Revenue Arrangement [Line Items]
Receivables, net	$ 525.3	$ 525.3			$ 586.2					$ 525.3	$ 586.2
Contract liability	52.2	52.2			55.9					52.2	55.9
Net sales and other revenue	1,100.0	15,436.8	$ 14,103.2	$ 14,176.7	14,016.6	$ 13,840.4	$ 14,024.1	$ 18,738.4	$ 18,653.4	62,455.1	60,534.5	$ 59,924.6
Reduction of inventory for Vendor Allowance	72.0	72.0			74.8					72.0	74.8
Advertising costs										405.6	422.3	497.5
Cooperative advertising allowances										91.9	101.3	81.1
Pharmacy
Deferred Revenue Arrangement [Line Items]
Receivables, net	$ 218.5	$ 218.5			$ 252.2					218.5	252.2
Net sales and other revenue										$ 5,236.8	$ 4,986.6	$ 5,002.6