Restaurant Impairments, Closure Costs and Asset Disposals - Narrative (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 29, 2020 USD ($) restaurant	Oct. 01, 2019 USD ($) restaurant	Sep. 29, 2020 USD ($) restaurant	Oct. 01, 2019 USD ($) restaurant
Property, Plant and Equipment Impairment or Disposal [Abstract]
Number of restaurants impaired	0	0	5	2
Number of restaurants closed that were near end of lease term	3
Offset adjustment to closure costs related to lease terminations | $	$ 0.6	$ 0.8	$ 0.6	$ 0.7