Basis Of Presentation (Details) $ in Thousands	4 Months Ended
	Jan. 21, 2018 USD ($) segment restaurant	Jan. 22, 2017 USD ($) restaurant
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]
Number of restaurants | restaurant	2,250	2,261
Number of reportable segments | segment	2
Contractual obligation	5.00%
Marketing and advertising expense	$ 8,900	$ 12,000
Excess tax benefits from share-based compensation arrangements	802	3,981
Net assets, adjusted balance	200
Net periodic benefit cost excluding service cost	$ 100	$ 600
Entity Operated Units
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]
Number of restaurants | restaurant	255	419
Franchised Units
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]
Number of restaurants | restaurant	1,995	1,842