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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
12 Months Ended
Feb. 23, 2019
Feb. 24, 2018
Feb. 25, 2017
Deferred Revenue Arrangement [Line Items]      
Receivables, net $ 586.2 $ 615.3  
Contract liability 55.9 55.6  
Reduction of inventory for Vendor Allowance 74.8 60.6  
Advertising costs 422.3 497.5 $ 502.4
Cooperative advertising allowances 101.3 81.1 $ 71.9
Pharmacy      
Deferred Revenue Arrangement [Line Items]      
Receivables, net $ 252.2 $ 205.5