Nature of Operations and Summary of Significant Accounting Policies (Narrative) (Details) $ in Thousands	12 Months Ended
	Oct. 01, 2023 USD ($) restaurant segment reporting_unit	Oct. 02, 2022 USD ($)	Oct. 03, 2021 USD ($)
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]
Restricted cash	$ 28,254	$ 27,150
Capitalized software implementation costs	7,900	10,700
Amortization expense for software implementation costs	5,000	5,100	$ 2,500
Depreciation	$ 61,700	55,800	46,500
Number of operating segments | segment	2
Number of reporting units | reporting_unit	2
Deferred gift card income	$ 19,397	18,525
Amounts recognized on unredeemed gift card balances	1,600	$ 700	$ 600
General liability and workers' comp estimated claims to be paid by insurance providers	$ 31,300
Contractual contributions	5.00%	5.00%	5.00%
Accrued advertising costs	$ 10,300	$ 3,500
Marketing and advertising expense	$ 38,900	32,600	$ 19,600
Del Taco
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount	9.00%
Del Taco | Trademarks and Trade Names
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]
Reporting Unit, Percentage of Fair Value in Excess of Carrying Amount	13.00%
Del Taco | Entity Operated Units
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]
Number of restaurants | restaurant	171
Del Taco | Franchised Units
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]
Number of restaurants | restaurant	421
Jack in the Box
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]
Number of restaurants | restaurant	9
Jack in the Box | Entity Operated Units
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]
Number of restaurants | restaurant	142
Jack in the Box | Franchised Units
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]
Number of restaurants | restaurant	2,044
Sales Concentration Risk | Revenue Benchmark | Del Taco
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]
Concentration risk, percentage	4.00%
Other Assets
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]
Cash surrender value of life insurance	$ 113,200	108,900
Accrued Liabilities
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]
Deferred gift card income	$ 2,900	$ 4,100
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