Supplemental Financial Information - Accounts Receivable (Details) - USD ($) $ in Thousands	Mar. 29, 2022	Dec. 28, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable	$ 4,425	$ 3,958
Delivery program receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable	1,812	1,467
Vendor rebate receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable	943	695
Franchise receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable	772	644
Other receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable	$ 898	$ 1,152