Supplemental Financial Information - Accounts Receivable (Details) - USD ($) $ in Thousands	Sep. 27, 2022	Dec. 28, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable	$ 5,122	$ 3,958
Delivery program receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable	1,445	1,467
Vendor rebate receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable	705	695
Franchise receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable	1,940	644
Other receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable	$ 1,032	$ 1,152