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COVID-19 Pandemic (Details)
3 Months Ended 9 Months Ended
Sep. 26, 2020
Jun. 27, 2020
Sep. 26, 2020
Unusual or Infrequent Item, or Both [Line Items]      
Increase (decrease) in net sales (as a percent)   (20.00%) 3.00%
Increase in net income (as a percent)     35.00%
Average      
Unusual or Infrequent Item, or Both [Line Items]      
Average percentage of stores that are open (more than) 98.00% 47.00%