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COVID-19 Pandemic (Details) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 27, 2020 | Jan. 02, 2021 | Jan. 02, 2021
Unusual or Infrequent Item, or Both [Line Items] |  |  |
Increase (decrease) in net sales (as a percent) | (20.00%) |  | 9.00%
Increase in net income (as a percent) |  |  | 70.00%
Average |  |  |
Unusual or Infrequent Item, or Both [Line Items] |  |  |
Percentage of stores that are closed | 47.00% |  |
Average percentage of stores that are open (more than) |  | 99.00% |

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