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Commitments and Contingencies (Additional Information) (Details)				1 Months Ended	12 Months Ended
	Feb. 08, 2023 USD ($)	Oct. 24, 2022 USD ($)	Apr. 17, 2019 restaurants	Aug. 31, 2010 formerEmployee	Sep. 28, 2025 USD ($)	Sep. 29, 2024 USD ($)
Loss Contingencies [Line Items]
Legal accruals					$ 19,607,000	$ 16,220,000
Lease guarantee					$ 21,200,000
Qdoba guaranteed leases, remaining term					12 years
Restricted cash					$ 2,000,000
Financial Guarantee
Loss Contingencies [Line Items]
Lease guarantee					800,000
Coca-Cola and Dr. Pepper Purchase Commitments
Loss Contingencies [Line Items]
Unconditional purchase obligations					$ 136,800,000
Unrecorded purchase obligation period					12 years
Vendors Providing Information Technology Services
Loss Contingencies [Line Items]
Unconditional purchase obligations					$ 7,800,000
Unrecorded purchase obligation period					6 years
Information technology services, early contract termination fees					$ 0
Gessele v. Jack in the Box Inc.
Loss Contingencies [Line Items]
Number of former employees who instituted litigation | formerEmployee				5
Loss contingency, damages awarded, value		$ 6,400,000
Interest Expense, Interest-Bearing Liability		$ 10,100,000
J&D Restaurant Group v. Jack in the Box Inc.
Loss Contingencies [Line Items]
Loss contingency, damages awarded, value	$ 8,000,000
Number of perspective purchasers | restaurants			2

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