Basis Of Presentation (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Jul. 07, 2019 USD ($) restaurant	Jul. 08, 2018 USD ($) restaurant	Jul. 07, 2019 USD ($) segment restaurant	Jul. 08, 2018 USD ($) restaurant	Sep. 30, 2018 USD ($)
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]
Number of restaurants | restaurant	2,242	2,241	2,242	2,241
Number of reporting segments | segment			1
Contractual obligation			5.00%
Incremental Corporate Advertising Contributions			$ 2,000	$ 3,300
Marketing and advertising expense	$ 4,000	$ 5,900	15,000	22,000
Deferred tax assets	(72,903)		(72,903)		$ (62,140)
Pension Cost Reclassification	$ 342	$ 423	$ 1,141	$ 1,410
Entity Operated Units
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]
Number of restaurants | restaurant	137	146	137	146
Franchised Units
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]
Number of restaurants | restaurant	2,105	2,095	2,105	2,095
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member] | Franchise Fees [Member]
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption	$ 50,300		$ 50,300
Contract with Customer, Liability, Current	4,968		4,968
Contract liabilities noncurrent	45,300		45,300
Deferred tax assets	$ 12,958		$ 12,958