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Discontinued Operations (Lease Guarantee Details) (Details) $ in Millions	12 Months Ended
	Sep. 29, 2019 USD ($)
Lease Guarantee [Abstract]
Contractual obligation	$ 32.1
Qdoba guaranteed leases, remaining term	16 years

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- Definition

Lease Guarantee [Abstract]

+ References

No definition available.

+ Details

Name:	jack_LeaseGuaranteeAbstract
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