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Summary of Significant Accounting Policies - Cost of revenue thru Estimates (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 22, 2017
Dec. 21, 2017
Feb. 29, 2020
Mar. 02, 2019
Dec. 31, 2018
Mar. 03, 2018
Advertising            
Advertising expenses, net of vendor advertising allowances     $ 142,079 $ 147,519   $ 161,826
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) 35.00% 35.00% 21.00% 21.00% 21.00% 32.60%
Pharmacy Services            
Vendor Rebates and Allowances and Purchase Discounts            
Period for rebates are dispensed to manufacturers     30 days