Supplemental Financial Information - Accounts Receivable (Details) - USD ($) $ in Thousands	Jun. 28, 2022	Dec. 28, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable	$ 3,967	$ 3,958
Delivery program receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable	1,432	1,467
Vendor rebate receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable	605	695
Franchise receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable	958	644
Other receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable	$ 972	$ 1,152