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Nature Of Operations And Summary Of Significant Accounting Policies (Narrative) (Details)
$ in Thousands
3 Months Ended 4 Months Ended 12 Months Ended
Sep. 30, 2018
USD ($)
restaurant
Jul. 08, 2018
USD ($)
Apr. 15, 2018
USD ($)
Oct. 01, 2017
USD ($)
Jul. 09, 2017
USD ($)
Apr. 16, 2017
USD ($)
Jan. 21, 2018
USD ($)
Jan. 22, 2017
USD ($)
Sep. 30, 2018
USD ($)
restaurant
Oct. 01, 2017
USD ($)
Oct. 02, 2016
USD ($)
Sep. 27, 2015
Oct. 01, 2018
USD ($)
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]                          
Revenues $ 177,472 $ 187,983 $ 209,772 $ 232,125 $ 246,101 $ 265,884 $ 294,463 $ 353,181 $ 869,690 $ 1,097,291 $ 1,162,258    
Excess Tax Benefit from Share-based Compensation, Operating Activities                 2,031 4,232 7,461    
Net Assets, Adjusted Balance $ 200               200        
Defined Benefit Plan, Net Periodic Benefit Cost Excluding Service Cost                 $ 100        
Document Fiscal Year Focus                 2018        
Number of Restaurants | restaurant 10               10        
Assets held for sale and leaseback $ 2,591     10,152         $ 2,591 10,152      
Assets Held-for-sale, Not Part of Disposal Group, Other 11,356     8,315         11,356 8,315      
Assets Held-for-sale, Not Part of Disposal Group, Current 13,947     42,732         13,947 42,732      
Depreciation                 59,400 67,400 72,800    
Increase (Decrease) in Gift Card Liability                 600 500 $ 400    
General liability and workers' comp estimated claims to be paid by insurance providers 3,700     3,900         $ 3,700 $ 3,900      
Marketing funds including contractual contributions                 5.00%        
Fiscal Year                 52 52 53 52  
Franchise rental agreement period                 P20Y        
Excess Tax Benefit from Share-based Compensation, Financing Activities                 $ 0 $ 4,232 $ 7,461    
Other Assets [Member]                          
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]                          
Cash Surrender Value of Life Insurance 109,900     110,100         109,900 110,100      
Current Maturities of Long-Term Debt [Member]                          
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]                          
Unamortized Debt Issuance Expense 1,008     1,502         $ 1,008 1,502      
Minimum [Member]                          
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]                          
Property, plant and equipment assigned lives                 1 year        
Maximum [Member]                          
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]                          
Property, plant and equipment assigned lives                 35 years        
Qdoba [Member]                          
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]                          
Assets held for sale and leaseback $ 0     $ 24,265         $ 0 24,265      
Accounting Standards Update 2014-09                          
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]                          
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Net Income                 $ 160,000 $ 150,000      
Subsequent Event [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09                          
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]                          
Contract with Customer, Liability                         $ 50,000