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v3.19.3.a.u2

Discontinued Operations - Lease Guarantees (Details) $ in Thousands | 4 Months Ended
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Jan. 19, 2020 USD ($)
Discontinued Operations and Disposal Groups [Abstract] |
Lease guarantee | $ 31,200
Qdoba guaranteed leases, remaining term | 16 years

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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

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- References No definition available. + Details
Name: | us-gaap_DiscontinuedOperationsAndDisposalGroupsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration