Leases - (Lease Costs) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 27, 2023	Dec. 28, 2022
Finance lease costs:
Amortization of right-of-use assets	$ 1,451	$ 1,704
Interest on lease liabilities	2,139	2,350
Sublease income:
Total lease costs	13,477	11,183
Occupancy
Operating lease costs:
Operating lease costs	8,841	7,624
Variable lease costs:
Variable lease costs	4,803	3,988
Costs of franchise and license revenue
Operating lease costs:
Operating lease costs	14,022	15,541
Variable lease costs:
Variable lease costs	6,232	6,596
General and administrative expenses
Operating lease costs:
Operating lease costs	629	564
Variable lease costs:
Variable lease costs	271	255
Restructuring charges and exit costs
Operating lease costs:
Operating lease costs	175	201
Variable lease costs:
Variable lease costs	46	34
Sublease income:
Sublease income	(166)	(229)
Franchise and license revenue
Sublease income:
Sublease income	$ (24,966)	$ (27,445)