Contingencies and Legal Matters (Details) $ in Thousands	1 Months Ended	4 Months Ended
	Aug. 31, 2010 former_employee	Jan. 17, 2021 USD ($)	Sep. 27, 2020 USD ($)
Loss Contingencies [Line Items]
Accrual of loss contingency		$ 3,800	$ 3,800
Lease guarantee		$ 27,500
Qdoba guaranteed leases, remaining term		15 years
Gessele v. Jack in the Box Inc.
Loss Contingencies [Line Items]
Number of former employees | former_employee	5