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v3.22.2.2

Revenue (Narrative) (Details) $ in Millions | 12 Months Ended
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Oct. 02, 2022 USD ($)
Revenue from Contract with Customer [Abstract] |
Initial franchise fees, term | 20 years
Development fees for unopened stores | $ 5.5

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- Definition Contract With Customer, Liability, Development Fees For Unopened Stores + References No definition available. + Details
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Namespace Prefix: | jack_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Contract With Customer, Liability, Initial Franchise Fees, Term + References No definition available. + Details
Name: | jack_ContractWithCustomerLiabilityInitialFranchiseFeesTerm
Namespace Prefix: | jack_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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