Summary of Refranchising and Franchise Acquisitions - Additional Information (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 16, 2020 USD ($)	Mar. 24, 2020 restaurants	Jun. 16, 2020 USD ($) state restaurants	Jun. 18, 2019 USD ($) restaurants franchise
Franchise Acquisitions [Abstract]
Business combination recognized identifiable assets acquired and liabilities assumed, operating lease right of use assets				$ 858
Business combination recognized identifiable assets acquired and liabilities assumed, operating lease liabilities				$ 858
Significant Changes, Franchises Purchased During Period			0	3
Goodwill, Acquired During Period				$ 2,672
Company-operated restaurants sold to franchisees | restaurants		5	6	13
Assets Held For Sale, Restaurants Reclassified To Held For Use | restaurants			14
Assets Held For Sale, Loss From Reclassification			$ 500
Assets Held For Sale, Restaurants Classified As Held For Sale | restaurants		19
Below Market Lease, Acquired				$ 130
Impairment of Long-Lived Assets to be Disposed of	$ 200