Transactions with Related Parties (Details) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 29, 2020 USD ($) Rate shares	Mar. 31, 2019 USD ($)	Dec. 29, 2019 USD ($) shares	May 01, 2019 state restaurant	Apr. 30, 2019 state restaurant
Related Party Transaction [Line Items]
Right of First Refusal, Number of States	20
Preferred stock, shares issued | shares	100		100
Board of directors, number of members	2
Franchise agreement, term	20 years
Accounts payable to BKC	$ 12,700		$ 14,000
Gain on Business Interruption Insurance Recovery		$ 100
Other Income		1,900
Affiliated Entity [Member]
Related Party Transaction [Line Items]
Preferred stock, ownership percentage if converted | Rate	15.20%
Initial Franchise Fees	$ 50
Franchise Term	20 years
Property leases	244
Operating Leases, Rent Expense	$ 6,700	6,800
Royalty Expense	15,100	12,400
Advertising Expense	$ 13,400	$ 11,500
BKC Subleases with third-party lessor [Member] | Affiliated Entity [Member]
Related Party Transaction [Line Items]
Property leases	111
Area Development And Remodeling Agreement [Member]
Related Party Transaction [Line Items]
Right of First Refusal, Number of States | state				2	16
Initial Franchise Fees			$ 3,000
Right of first refusal, number of counties | state					4
Right of first refusal, number of franchises | restaurant					500
Franchise agreement, number of restaurants to be remodeled | restaurant				80
Franchise Agreement, Number Of Restaurants To Be Built, Year Six	6 years
Royalty Agreement Terms [Member] | Burger King Corporate [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Rate | Rate	4.50%
Royalty Agreement Terms [Member] | Popeyes [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Rate | Rate	5.00%
Selling and Marketing Expense [Member] | Affiliated Entity [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Rate | Rate	4.00%