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v3.19.3

Discontinued Operations (Lease Guarantee Details) (Details) $ in Millions | 12 Months Ended
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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

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- 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

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- 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