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Commitments and Contingencies (Additional Information) (Details)					1 Months Ended	12 Months Ended
	Feb. 08, 2023 USD ($)	Oct. 24, 2022 USD ($)	Jun. 04, 2022 USD ($)	Apr. 17, 2019 restaurants	Aug. 31, 2010 formerEmployee	Sep. 29, 2024 USD ($)	Oct. 01, 2023 USD ($)
Loss Contingencies [Line Items]
Legal accruals						$ 16,220,000	$ 40,877,000
Lease guarantee						$ 20,100,000
Qdoba guaranteed leases, remaining term						13 years
Coca-Cola and Dr. Pepper Purchase Commitments
Loss Contingencies [Line Items]
Unconditional purchase obligations						$ 89,900,000
Unrecorded purchase obligation period						6 years
Vendors Providing Information Technology Services
Loss Contingencies [Line Items]
Unconditional purchase obligations						$ 10,600,000
Unrecorded purchase obligation period						4 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		$ 9,300,000
Torrez v. Jack in the Box | Settled Litigation
Loss Contingencies [Line Items]
Legal accruals						0
Loss contingency, damages awarded, value			$ 50,000,000
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
Loss contingency accrued amount						$ 0

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