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Summary Of Refranchisings, Franchisee Development And Acquisitions (Purchase Price Allocations On Franchise Acquisitions) (Details) (USD $)
4 Months Ended
Jan. 18, 2015
restaurant
Jan. 19, 2014
restaurant
Summary Of Refranchisings, Franchisee Development And Acquisitions [Line Items]    
Proceeds From Extension Of Franchise And Lease Agreements $ 100,000jack_ProceedsFromExtensionOfFranchiseAndLeaseAgreements $ 500,000jack_ProceedsFromExtensionOfFranchiseAndLeaseAgreements
Significant Changes, Franchises Sold 1us-gaap_SignificantChangesFranchisesSold 0us-gaap_SignificantChangesFranchisesSold
Proceeds from Divestiture of Businesses 1,174,000us-gaap_ProceedsFromDivestitureOfBusinesses 468,000us-gaap_ProceedsFromDivestitureOfBusinesses
Significant Changes, Franchises Purchased During Period 0us-gaap_SignificantChangesFranchisesPurchasedDuringPeriod  
Assets, Written off Related to Sale of Business Unit (489,000)jack_AssetsWrittenOffRelatedToSaleOfBusinessUnit 0jack_AssetsWrittenOffRelatedToSaleOfBusinessUnit
Goodwill, Written off Related to Sale of Business Unit 16,000us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit  
Disposal Group Not Discontinued Operation Other Gain Loss On Disposal 181,000jack_DisposalGroupNotDiscontinuedOperationOtherGainLossOnDisposal 2,000jack_DisposalGroupNotDiscontinuedOperationOtherGainLossOnDisposal
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal 850,000us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal 461,000us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal
Number of New Restaurants Opened by Franchisees 12jack_NumberOfNewRestaurantsOpenedByFranchisees 13jack_NumberOfNewRestaurantsOpenedByFranchisees
Jack In The Box [Member]    
Summary Of Refranchisings, Franchisee Development And Acquisitions [Line Items]    
Significant Changes, Franchises Purchased During Period 0us-gaap_SignificantChangesFranchisesPurchasedDuringPeriod
/ us-gaap_StatementBusinessSegmentsAxis
= jack_JackInTheBoxMember
4us-gaap_SignificantChangesFranchisesPurchasedDuringPeriod
/ us-gaap_StatementBusinessSegmentsAxis
= jack_JackInTheBoxMember
Property and equipment 0us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_StatementBusinessSegmentsAxis
= jack_JackInTheBoxMember
1,398,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_StatementBusinessSegmentsAxis
= jack_JackInTheBoxMember
Reacquired franchise rights 0us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_StatementBusinessSegmentsAxis
= jack_JackInTheBoxMember
96,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_StatementBusinessSegmentsAxis
= jack_JackInTheBoxMember
Liabilities assumed 0us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities
/ us-gaap_StatementBusinessSegmentsAxis
= jack_JackInTheBoxMember
 
Goodwill, Acquired During Period 0us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_StatementBusinessSegmentsAxis
= jack_JackInTheBoxMember
256,000us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_StatementBusinessSegmentsAxis
= jack_JackInTheBoxMember
Total consideration 0us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
/ us-gaap_StatementBusinessSegmentsAxis
= jack_JackInTheBoxMember
1,750,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
/ us-gaap_StatementBusinessSegmentsAxis
= jack_JackInTheBoxMember
Goodwill, Written off Related to Sale of Business Unit 16,000us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit
/ us-gaap_StatementBusinessSegmentsAxis
= jack_JackInTheBoxMember
9,000us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit
/ us-gaap_StatementBusinessSegmentsAxis
= jack_JackInTheBoxMember
Subtotal of gains (losses) on sale of company-operated restaurants [Member]    
Summary Of Refranchisings, Franchisee Development And Acquisitions [Line Items]    
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal   $ 461,000us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal
/ jack_SubtotalOfGainsLossesOnSalesOfCompanyOperatedRestaurantsAxis
= jack_SubtotalOfGainsLossesOnSaleOfCompanyOperatedRestaurantsMember