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Receivables (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 23, 2020	Sep. 23, 2020	Dec. 25, 2019
Receivables, net:
Trade accounts receivable from franchisees	$ 17,306	$ 17,306	$ 14,551
Financing receivables from franchisees	1,283	1,283	2,230
Allowance for doubtful accounts	(1,699)	(1,699)	(274)
Total receivables, net	20,637	20,637	27,488
Other noncurrent assets:
Financing receivables from franchisees	188	188	364
Additional bad debt expense	500	1,400
Vendor receivables
Receivables, net:
Other receivables, gross, current	894	894	3,260
Credit card receivables
Receivables, net:
Other receivables, gross, current	587	587	6,806
Other
Receivables, net:
Other receivables, gross, current	$ 2,266	$ 2,266	$ 915

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