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Discontinued Operations (Lease Guarantee Details) (Details)	12 Months Ended
	Sep. 27, 2020 USD ($)
Lease Guarantee [Abstract]
Contractual obligation	$ 29,800,000
Qdoba guaranteed leases, remaining term	15 years
Accrued amount related to guarantees	$ 0

X

- Definition

Lease Guarantee [Abstract]

+ References

No definition available.

+ Details

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Namespace Prefix:	jack_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Lessee, Guaranteed Leases, Remaining Term

+ References

No definition available.

+ Details

Name:	jack_LesseeGuaranteedLeasesRemainingTerm
Namespace Prefix:	jack_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

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

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

X

- Definition

The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=118943654&loc=d3e12069-110248

+ Details

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