Commitments and Contingencies - Additional Information (Details)	3 Months Ended		9 Months Ended
	Sep. 26, 2018 USD ($) lawsuit	Sep. 27, 2017 USD ($)	Sep. 26, 2018 USD ($) lawsuit agreement lease	Sep. 27, 2017 USD ($)
Other Commitments [Line Items]
Date of class action filed in court			On or about February 24, 2014
Number of lawsuits consolidated | lawsuit	2		2
Accrual associated with loss contingencies	$ 0		$ 0
Employment agreement expense	0	$ 0	$ 800,000	$ 0
Officers
Other Commitments [Line Items]
Number of at-will employment agreements | agreement			2
Property Lease Guarantee
Other Commitments [Line Items]
Number of leases assigned to franchisees | lease			5
Latest lease expiration year			2036
Contingent lease obligations, maximum exposure	2,500,000		$ 2,500,000
Contingent lease obligations, maximum exposure, if discounted at estimated pre-tax cost of debt	2,100,000		2,100,000
Chicken
Other Commitments [Line Items]
Purchase commitments, estimated obligations	$ 7,300,000		7,300,000
Impact Damages
Other Commitments [Line Items]
Value of damages awarded			4,356,600
Lost Opportunity Damages
Other Commitments [Line Items]
Value of damages awarded			4,481,206
Total Damages
Other Commitments [Line Items]
Value of damages awarded			$ 8,837,806