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Refranchisings (Details) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 27, 2019 USD ($) Units restaurant	Mar. 28, 2018 USD ($) Units restaurants	Dec. 26, 2018 USD ($)
Franchisor Disclosure [Line Items]
Noncash consideration	$ 3,000	$ 0
Less: Goodwill related to the sales of company restaurants	(1,600)
Gains on sales of assets and other, net	9,475	$ 37
Assets held for sale	14,956		$ 723
Assets held for sale, property	11,700
Assets held for sale, goodwill	1,600
Assets held for sale, intangibles	$ 1,700
Assets held for sale, description	48 company restaurants		three company restaurants and one piece of real estate
Real Estate [Member]
Franchisor Disclosure [Line Items]
Real estate sold | Units	1	0
Cash proceeds	$ 4,688	$ 0
Noncash consideration	3,000	0
Less: Property sold	(190)	0
Gains on sales of assets and other, net	$ 7,498	$ 0
Franchisor Owned Outlet [Member]
Franchisor Disclosure [Line Items]
Restaurants sold to franchisees	3	0
Cash proceeds	$ 2,833	$ 0
Less: Property sold	(550)	0
Less: Goodwill related to the sales of company restaurants	(79)	0
Gains on sales of assets and other, net	2,204	0
Assets held for sale, goodwill	$ 79	$ 0

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