Franchise Rights (Details)	3 Months Ended		9 Months Ended
	Sep. 27, 2020 USD ($)	Sep. 29, 2019 USD ($)	Sep. 27, 2020 USD ($) period	Sep. 29, 2019 USD ($)
Finite-Lived Intangible Assets [Line Items]
Franchise agreement, number of renewal periods | period			1
Franchise agreement, term			20 years
Franchise RIghts Rollforward [Abstract]
Balance, beginning			$ 348,941,000
Amortization of intangible assets, franchise rights	$ (3,400,000)	$ (3,900,000)	(10,712,000)	$ (8,000,000.0)
Balance, end	338,229,000		338,229,000
Next fiscal year	13,700,000		13,700,000
Second Fiscal Year	13,700,000		13,700,000
Third Fiscal Year	13,700,000		13,700,000
Fourth Fiscal Year	13,700,000		13,700,000
Fifth Fiscal Year	13,700,000		13,700,000
Franchise Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Impairment of intangible assets (excluding goodwill)	0	$ 0	0	$ 0
Franchise RIghts Rollforward [Abstract]
Amortization expense, expected for full fiscal period	$ 14,300,000		$ 14,300,000