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Leases (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Jul. 05, 2020 | Apr. 12, 2020
Lessee, Lease, Description [Line Items] |  |
Initial term of operating lease | 20 years |
Amount of rent deferred under temporary rent concessions | $ 15,500 |
Lease liabilities subject to accretion | 934,500 |
Lease liabilities related to April rent deferrals | $ 12,700 |
Portion of April rents due from franchisees that has been postponed (percent) | 40.00% |
Portion of April rents due from franchisees that has been postponed | $ 2,900 | $ 9,100
Rent concessions secured from landlords passed on to franchisees | 5,600 |
Collected Postponed Marketing Fees | $ 6,200 |
Minimum |  |
Lessee, Lease, Description [Line Items] |  |
Renewal term of operating lease | 1 year |
Minimum | Restaurant and Office Equipment |  |
Lessee, Lease, Description [Line Items] |  |
Initial term of operating lease | 3 years |
Maximum |  |
Lessee, Lease, Description [Line Items] |  |
Renewal term of operating lease | 20 years |
Maximum | Restaurant and Office Equipment |  |
Lessee, Lease, Description [Line Items] |  |
Initial term of operating lease | 8 years |

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- Definition Collected Postponed Marketing Fees + References No definition available. + Details
Name: | jack_CollectedPostponedMarketingFees
Namespace Prefix: | jack_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Lessee, Lease Liabilities, Deferred + References No definition available. + Details
Name: | jack_LesseeLeaseLiabilitiesDeferred
Namespace Prefix: | jack_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Lessee, Lease Liabilities, Subject to Accretion + 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 Lessee, Temporary Rent Concession, Deferral of Payment + References No definition available. + Details
Name: | jack_LesseeTemporaryRentConcessionDeferralOfPayment
Namespace Prefix: | jack_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Lessor, Portion of Monthly Rent Postponed, Amount + 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 Lessor, Portion of Monthly Rent Postponed, Percent + References No definition available. + Details
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Namespace Prefix: | jack_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Lessor, Rent Concession Deferrals Passed Through to Lessees + References No definition available. + Details
Name: | jack_LessorRentConcessionDeferralsPassedThroughToLessees
Namespace Prefix: | jack_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | instant

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- Definition Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980 + Details
Name: | us-gaap_LesseeOperatingLeaseTermOfContract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=jack_RestaurantAndOfficeEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |