Acquisition Net Assets Acquired (Details) - USD ($) $ in Thousands	Sep. 29, 2019	Dec. 30, 2018
Business Acquisition [Line Items]
Franchise rights	$ 154,308
Goodwill	143,568	$ 38,469
Agreement And Plan Of Merger - Cambridge Holdings, LLC [Member]
Business Acquisition [Line Items]
Inventory	2,915
Other assets	2,877
Land and buildings	20,440
Restaurant equipment	24,584
Right-of-use assets	251,421
Leasehold improvements	3,941
Deferred taxes	35,264
Goodwill	104,996
Right-of-use liabilities	(255,015)
Accounts payable	(4,614)
Net assets acquired	259,801
Prepaid expenses	2,889
Franchise fees	7,300
Franchise rights	144,499
Accrued payroll, related taxes and benefits	(3,142)
Other liabilities	(8,026)
2019 Acquisition [Member]
Business Acquisition [Line Items]
Inventory	158
Right-of-use assets	9,515
Restaurant equipment	743
Restaurant equipment - subject to finance leases	150
Leasehold improvements	6,205
Franchise fees	394
Franchise rights	9,809
Deferred income taxes	16
Goodwill	103
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Operating Lease Liabilities	(9,968)
Finance lease liabilities for restaurant equipment	(185)
Accounts payable	(44)
Net assets acquired	$ 16,896
2018 Acquisitions [Member]
Business Acquisition [Line Items]
Inventory		401
Restaurant equipment		2,092
Restaurant equipment - subject to finance leases		43
Leasehold improvements		1,329
Franchise fees		1,264
Franchise rights		31,275
Favorable leases		587
Deferred income taxes		346
Goodwill		1,677
Finance lease liabilities for restaurant equipment		(49)
Unfavorable leases		(624)
Accounts payable		(9)
Net assets acquired		$ 38,332