Acquisition Net Assets Acquired (Details) - USD ($) $ in Thousands	Sep. 27, 2020	Dec. 29, 2019
Business Acquisition [Line Items]
Goodwill	$ 122,619	$ 122,619
2019 Acquisition [Member]
Business Acquisition [Line Items]
Inventory	158
Restaurant equipment	743
Restaurant equipment - subject to finance leases	150
Right-of-use assets	9,515
Leasehold improvements	6,205
Franchise fees	394
Franchise rights	9,809
Deferred income taxes	29
Goodwill	86
Finance lease liabilities for restaurant equipment	(185)
Operating lease liabilities	(9,968)
Accounts payable	(40)
Net assets acquired	$ 16,896
Agreement And Plan Of Merger - Cambridge Holdings, LLC [Member]
Business Acquisition [Line Items]
Inventory		2,839
Prepaid expenses		2,947
Other assets		1,846
Land and buildings		21,257
Restaurant equipment		25,358
Restaurant equipment - subject to finance leases		488
Right-of-use assets		251,431
Leasehold improvements		3,498
Franchise fees		7,300
Franchise rights		174,500
Deferred income taxes		44,292
Goodwill		84,060
Finance lease liabilities for restaurant equipment		(568)
Operating lease liabilities		(255,897)
Accounts payable		(8,014)
Accrued payroll, related taxes and benefits		(3,133)
Other liabilities		(4,537)
Net assets acquired		$ 259,083