Commitments and Contingencies - Additional Information (Detail)	3 Months Ended
	Mar. 28, 2018 USD ($) lawsuit agreement lease
Other Commitments [Line Items]
Date of class action filed in court	On or about February 24, 2014
Number of lawsuits consolidated | lawsuit	2
Loss Contingency Accrual	$ 0
Officers
Other Commitments [Line Items]
Number of at-will employment agreements | agreement	3
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
Contingent lease obligations, maximum exposure, if discounted at estimated pre-tax cost of debt	2,200,000
Chicken
Other Commitments [Line Items]
Purchase commitments, estimated obligations	22,100,000
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