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Basis Of Presentation (Details)
$ in Thousands
4 Months Ended
Jan. 20, 2019
USD ($)
restaurant
Jan. 21, 2018
USD ($)
restaurant
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]    
Pension Cost Reclassification $ 456 $ 564
Document Fiscal Year Focus 2019  
Number of restaurants | restaurant 2,241 2,250
Contractual obligation 5.00%  
Incremental Corporate Advertising Contributions $ 2,000  
Marketing and advertising expense $ 7,200 $ 8,900
Entity Operated Units    
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]    
Number of restaurants | restaurant 137 255
Franchised Units    
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]    
Number of restaurants | restaurant 2,104 1,995
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  
Contract with Customer, Liability, Current (4,963)  
Contract liabilities noncurrent $ 45,300