Summary Of Refranchisings, Franchisee Development And Acquisitions (Number Of Restaurants Sold And Developed By Franchisees And Related Gains And Fees Recognized) (Details) $ in Thousands		4 Months Ended
		Jan. 20, 2019 USD ($) restaurant	Jan. 21, 2018 USD ($) restaurant
Summary Of Refranchisings, Franchisee Development And Acquisitions [Line Items]
Restaurants sold to franchisees | restaurant		0	22
New restaurants opened by franchisees | restaurant		9	5
Cash (1)	[1]	$ 133	$ 5,591
Total Proceeds from the Sale of Company-Operated Restaurants		133	14,675
Net assets sold (primarily property and equipment)		0	(3,637)
Goodwill related to the sale of company-operated restaurants		(2)	(153)
Other (2)	[2]	88	(1,945)
Gains on the sale of company-operated restaurants		219	8,940
Additional proceeds from the sale of a company-operated restaurant		100	1,200
Notes Receivable [Member]
Summary Of Refranchisings, Franchisee Development And Acquisitions [Line Items]
Notes receivable		$ 0	9,084
Remodel Credit [Member]
Summary Of Refranchisings, Franchisee Development And Acquisitions [Line Items]
Other (2)			$ 1,500

[1] Amounts in 2019 and 2018 include additional proceeds of $0.1 million and $1.2 million, respectively, related to restaurants sold in prior years.

[2] Amounts in 2018 primarily relate to $1.5 million of remodel credits.