Contingencies and Legal Matters (Details) $ in Millions	1 Months Ended	4 Months Ended
	Aug. 31, 2010 former_employee	Jan. 23, 2022 USD ($)	Oct. 03, 2021 USD ($)
Loss Contingencies [Line Items]
Accrual of loss contingency		$ 6.8	$ 7.5
Lease guarantee		$ 26.7
Qdoba guaranteed leases, remaining term		16 years
Gessele v. Jack in the Box Inc.
Loss Contingencies [Line Items]
Number of former employees | former_employee	5