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Contingencies and Legal Matters (Details) $ in Thousands	1 Months Ended	9 Months Ended
	Aug. 31, 2010 former_employee	Jul. 04, 2021 USD ($)	Sep. 27, 2020 USD ($)
Loss Contingencies [Line Items]
Accrual of loss contingency		$ 7,400	$ 3,800
Lease guarantee		$ 27,400
Qdoba guaranteed leases, remaining term		17 years
Gessele v. Jack in the Box Inc.
Loss Contingencies [Line Items]
Number of former employees | former_employee	5

X

- Definition

Lessee, Guaranteed Leases, Remaining Term

+ References

No definition available.

+ Details

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Balance Type:	na
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X

- Definition

Number of Former Employees

+ References

No definition available.

+ Details

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Namespace Prefix:	jack_
Data Type:	xbrli:integerItemType
Balance Type:	na
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X

- Definition

Amount of contractual obligation, including but not limited to, long-term debt, capital lease obligations, operating lease obligations, purchase obligations, and other commitments.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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X

- Definition

Amount of loss contingency liability.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349

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X

- Details

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