Commitments and Contingencies - Additional Information (Detail)	3 Months Ended		6 Months Ended
	Jun. 27, 2018 USD ($) lawsuit	Jun. 28, 2017 USD ($)	Jun. 27, 2018 USD ($) lawsuit agreement lease	Jun. 28, 2017 USD ($)
Other Commitments [Line Items]
Date of class action filed in court			On or about February 24, 2014
Number of lawsuits consolidated | lawsuit	2		2
Loss Contingency Accrual	$ 0		$ 0
Employment Agreement Expense	400,000	$ 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	$ 14,600,000		14,600,000
Impact Damages [Member]
Other Commitments [Line Items]
Loss Contingency, Damages Awarded, Value			4,356,600
Lost Opportunity Damages [Member]
Other Commitments [Line Items]
Loss Contingency, Damages Awarded, Value			4,481,206
Total Damages [Member]
Other Commitments [Line Items]
Loss Contingency, Damages Awarded, Value			$ 8,837,806