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Receivables - Receivables, Net (Details) - USD ($) $ in Thousands	Sep. 29, 2021	Dec. 30, 2020
Receivables, net:
Trade accounts receivable from franchisees	$ 13,194	$ 15,535
Financing receivables from franchisees	1,022	2,104
Allowance for doubtful accounts	(924)	(1,699)
Receivables, net	16,903	21,349
Other noncurrent assets:
Financing receivables from franchisees	342	502
Vendor receivables
Receivables, net:
Other receivables, gross, current	2,396	2,199
Credit card receivables
Receivables, net:
Other receivables, gross, current	473	542
Other
Receivables, net:
Other receivables, gross, current	$ 742	$ 2,668

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