Summary Of Refranchisings, Franchisee Development And Acquisitions (Number Of Restaurants Sold And Developed By Franchisees And Related Gains And Fees Recognized) (Details) $ in Thousands		3 Months Ended	4 Months Ended
		Apr. 15, 2018 USD ($)	Jan. 21, 2018 USD ($) restaurant	Jan. 22, 2017 USD ($) restaurant
Summary Of Refranchisings, Franchisee Development And Acquisitions [Line Items]
Restaurants sold to franchisees | restaurant			22	0
New restaurants opened by franchisees | restaurant			5	7
Initial franchise fees			$ 995	$ 290
Proceeds from Divestiture of Businesses	[1]		5,591	138
Proceeds from the sale of company-operated restaurants:			1,200	100
Proceeds from Sale and Collection of Receivables	[2]		9,084	0
Net assets sold (primarily property and equipment)			(3,637)	0
Goodwill related to the sale of company-operated restaurants			(153)	(1)
Other	[3]		(1,945)	0
Gains on the sale of company-operated restaurants			$ 8,940	$ 137
Number of restaurants | restaurant			2,250	2,261
Disposal Group, Held-for-sale, Not Discontinued Operations
Summary Of Refranchisings, Franchisee Development And Acquisitions [Line Items]
Number of restaurants		50
Disposal Group, Held-for-sale, Not Discontinued Operations | Equipment
Summary Of Refranchisings, Franchisee Development And Acquisitions [Line Items]
Number of restaurants | restaurant			10
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | Equipment
Summary Of Refranchisings, Franchisee Development And Acquisitions [Line Items]
Assets held for sale and leaseback			$ 800
Forecast | Minimum
Summary Of Refranchisings, Franchisee Development And Acquisitions [Line Items]
Proceeds from sale of franchisees		$ 2,000
Forecast | Maximum
Summary Of Refranchisings, Franchisee Development And Acquisitions [Line Items]
Proceeds from sale of franchisees		$ 3,000
Remodel Credit
Summary Of Refranchisings, Franchisee Development And Acquisitions [Line Items]
Other	[3]		$ 1,500

[1] (1)Amounts in 2018 and 2017 include additional proceeds of $1.2 million and $0.1 million, respectively, related to restaurants sold in prior years.

[2] (2)These notes were collected during 2018.

[3] Amount primarily relates to $1.5 million of remodel credits.