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Nature of Operations and Summary of Significant Accounting Policies (Narrative) (Details)
$ in Thousands
 12 Months Ended
Sep. 28, 2025
USD ($)
reporting_unit
restaurant
segment
Sep. 29, 2024
USD ($)
Oct. 01, 2023
USD ($)
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]      
Restricted cash $ 30,282 $ 29,422  
Capitalized software implementation costs 11,000 11,100  
Amortization expense for software implementation costs 2,400 4,500 $ 5,000
Depreciation $ 57,800 59,200 61,700
Number of operating segments | segment 2    
Number of reporting units | reporting_unit 2    
Deferred gift card income $ 393 0  
Amounts recognized on unredeemed gift card balances 600 800 $ 1,600
General liability and workers' comp estimated claims to be paid by insurance providers $ 28,100 $ 27,900  
Contractual contributions 5.00% 5.00% 5.00%
Marketing Fund, Incremental Contributions $ 6,300 $ 500 $ 200
Marketing and advertising expense 39,300 35,000 $ 38,900
Del Taco      
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]      
Accrued advertising costs $ (300) (800)  
Del Taco | Entity Operated Units      
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]      
Number of restaurants | restaurant 132    
Del Taco | Franchised Units      
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]      
Number of restaurants | restaurant 444    
Jack in the Box      
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]      
Accrued advertising costs $ 200 $ 800  
Jack in the Box | Entity Operated Units      
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]      
Number of restaurants | restaurant 150    
Jack in the Box | Franchised Units      
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]      
Number of restaurants | restaurant 1,986    
Sales Concentration Risk | Revenue Benchmark | Del Taco      
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]      
Concentration risk, percentage 4.00% 4.00% 4.00%
Other Assets      
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]      
Cash surrender value of life insurance $ 135,500 $ 129,700  
Accrued Liabilities      
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]      
Deferred gift card income $ 2,800 $ 2,700  
Minimum      
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]      
Property, plant and equipment assigned lives 1 year    
Maximum      
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]      
Property, plant and equipment assigned lives 35 years