Restaurant Impairments, Closure Costs and Asset Disposals - Narrative (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 28, 2021 restaurant	Sep. 29, 2020 USD ($) restaurant	Sep. 28, 2021 restaurant	Sep. 29, 2020 USD ($) restaurant
Property, Plant and Equipment Impairment or Disposal [Abstract]
Number of restaurants impaired	1	0	2	5
Number of restaurants closed			8	3
Offset adjustment to closure costs related to lease terminations | $		$ 0.6		$ 0.6