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Income Taxes - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Apr. 15, 2018
Apr. 16, 2017
Apr. 15, 2018
Apr. 16, 2017
Sep. 29, 2019
Sep. 30, 2018
Income Tax Contingency [Line Items]            
Statutory income tax rate, percent 29.40% 37.90% 29.10% 38.20%    
Tax Cuts and Jobs Act of 2017, income tax expense (benefit) $ 577 $ 0 $ 31,204 $ 0    
Income tax expense (benefit), continuing Operations, Adjustment of Deferred Tax (Asset) Liability     $ 30,300      
Effective tax rates [1] 31.40% 38.10% 60.70% 38.40%    
Forecast            
Income Tax Contingency [Line Items]            
Statutory income tax rate, percent         21.00% 24.50%
Qdoba            
Income Tax Contingency [Line Items]            
Tax Cuts and Jobs Act of 2017, income tax expense (benefit)     $ 2,300      
[1] (1)Percentages may not add due to rounding.