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Basis Of Presentation (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Apr. 11, 2021
USD ($)
restaurant
Apr. 12, 2020
USD ($)
restaurant
Apr. 11, 2021
USD ($)
restaurant
segment
Apr. 12, 2020
USD ($)
restaurant
Sep. 27, 2020
USD ($)
Segment Reporting Information [Line Items]          
Number of restaurants | restaurant 2,228 2,246 2,228 2,246  
Number of operating segments | segment     1    
Contractual obligation (percent)     5.00%    
Marketing and advertising expense $ 4,300 $ 3,500 $ 10,100 $ 8,900  
Restricted cash 18,100   18,100   $ 37,300
Uncollected Postponed Marketing Fees 5,500   5,500    
Accounts Receivable, Allowance for Credit Loss [Roll Forward]          
Accounts Receivable, Allowance for Credit Loss, Current     (5,541)    
Provision for Other Credit Losses     (476)    
Accounts Receivable, Allowance for Credit Loss, Writeoff     19    
Accounts Receivable, Allowance for Credit Loss, Current (5,998)   (5,998)    
Uncollected Postponed Marketing Fees 5,500   5,500    
Accounts Receivable [Member]          
Segment Reporting Information [Line Items]          
Uncollected Postponed Marketing Fees 4,400   4,400    
Accounts Receivable, Allowance for Credit Loss [Roll Forward]          
Uncollected Postponed Marketing Fees 4,400   4,400    
Other Noncurrent Assets [Member]          
Segment Reporting Information [Line Items]          
Uncollected Postponed Marketing Fees 1,100   1,100    
Accounts Receivable, Allowance for Credit Loss [Roll Forward]          
Uncollected Postponed Marketing Fees $ 1,100   $ 1,100    
Entity Operated Units          
Segment Reporting Information [Line Items]          
Number of restaurants | restaurant 148 144 148 144  
Franchised Units          
Segment Reporting Information [Line Items]          
Number of restaurants | restaurant 2,080 2,102 2,080 2,102