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Summary of Significant Accounting Policies - Cost of revenue thru Estimates (Details)
$ in Thousands
12 Months Ended
Feb. 27, 2021
USD ($)
item
Feb. 29, 2020
USD ($)
Mar. 02, 2019
USD ($)
Leases      
Maximum additional period for lease extension 5 years    
Number of fixed lease payment | item 1    
Advertising      
Advertising expenses, net of vendor advertising allowances $ 122,725 $ 142,079 $ 147,519
Insurance      
Self-insurance, minimum occurrence, workers' compensation 1,000    
Self-insurance, minimum occurrence, general liability $ 3,000    
Income Taxes      
Federal statutory rate (as a percent) 21.00%    
Pharmacy Services      
Vendor Rebates and Allowances and Purchase Discounts      
Period for rebates dispensed to manufacturers 30 days    
Rebates paid to clients, period in arrears 8 months