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Business Combination (Narrative) (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 08, 2022
Oct. 01, 2023
Oct. 01, 2023
Oct. 02, 2022
Oct. 03, 2021
Business Acquisition [Line Items]          
Goodwill   $ 329,986,000 $ 329,986,000 $ 366,821,000 $ 47,774,000
Del Taco          
Business Acquisition [Line Items]          
Goodwill   193,959,000 193,959,000 230,722,000 0
Revenues     316,900,000    
Net earnings   6,500,000      
Jack in the Box          
Business Acquisition [Line Items]          
Goodwill   136,027,000 $ 136,027,000 $ 136,099,000 $ 47,774,000
Del Taco          
Business Acquisition [Line Items]          
Consideration transferred $ 593,309,000        
Business acquisition, transaction costs 7,141,000        
Vesting period     1 year    
Acquisition related costs     $ 12,300,000    
Goodwill   $ 319,722,000 $ 319,722,000    
Goodwill, expected tax deductible amount 0        
Sublease liability $ 6,000,000        
Sublease useful life 15 years        
Del Taco | Del Taco          
Business Acquisition [Line Items]          
Ownership acquired 100.00%        
Del Taco | Common Stock          
Business Acquisition [Line Items]          
Conversion of shares into cash (in dollars per share) $ 12.51        
Del Taco | Syndicated Credit Facility | Del Taco          
Business Acquisition [Line Items]          
Repayments of debt $ 115,219,000