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Variable Interest Entities (Narrative) (Details) (Variable Interest Entity, Primary Beneficiary [Member], USD $)
Jan. 18, 2015
Variable Interest Entity [Line Items]  
Commitment to lending program from company through capital note $ 20,000,000jack_CommitmentFromParentThroughCapitalNote
Long-term Line of Credit 0us-gaap_LineOfCredit
F F E Facility Member  
Variable Interest Entity [Line Items]  
Senior secured revolving securitization facility $ 80,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= jack_FFEFacilityMember
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= us-gaap_VariableInterestEntityPrimaryBeneficiaryMember