Supplemental Financial Information - Accounts Receivable (Details) - USD ($) $ in Thousands	Dec. 28, 2021	Dec. 29, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable	$ 3,958	$ 3,428
Delivery program receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable	1,467	1,268
Vendor rebate receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable	695	641
Insurance receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable	0	74
Franchise receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable	644	564
Other receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable	$ 1,152	$ 881