Receivables (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 26, 2018	Dec. 25, 2019
Receivables, net:
Trade accounts receivable from franchisees	$ 11,459	$ 14,551
Financing receivables from franchisees	3,211	2,230
Allowance for doubtful accounts	(300)	(274)
Total receivables, net	26,283	27,488
Other noncurrent assets:
Financing receivables from franchisees	1,528	364
Write-off of financing receivables from a franchisee	200
Insurance receivable, current	1,000
Vendor receivables
Receivables, net:
Other receivable, gross, current	4,016	3,260
Credit card receivables
Receivables, net:
Other receivable, gross, current	5,955	6,806
Other
Receivables, net:
Other receivable, gross, current	$ 1,942	$ 915