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Discontinued Operations Lease Guarantee Details (Details) $ in Millions | Sep. 30, 2018 USD ($)
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Lease Guarantee [Abstract] |
Contractual Obligation | $ 38.7

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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 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