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Leases (Assets Recorded Under Finance Leases) (Details) - USD ($) $ in Thousands | Sep. 27, 2020 | Sep. 29, 2019
--- | --- | ---
Property, plant and Equipment [Line Items] |  |
Less accumulated amortization | $ (4,640) | $ (3,904)
Finance Lease, Right-of-Use Asset | 2,333 | 2,976
Buildings |  |
Property, plant and Equipment [Line Items] |  |
Finance lease, right-of-use asset before amortization | 1,342 | 1,342
Equipment |  |
Property, plant and Equipment [Line Items] |  |
Finance lease, right-of-use asset before amortization | $ 5,631 | $ 5,538

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- Definition Finance Lease, Right-of-Use Asset, Accumulated Amortization + References No definition available. + Details
Name: | jack_FinanceLeaseRightOfUseAssetAccumulatedAmortization
Namespace Prefix: | jack_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Finance Lease, Right-of-Use Asset, Gross + References No definition available. + Details
Name: | jack_FinanceLeaseRightOfUseAssetGross
Namespace Prefix: | jack_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount of lessee's right to use underlying asset under finance lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
Name: | us-gaap_FinanceLeaseRightOfUseAsset
Namespace Prefix: | us-gaap_
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
Name: | us-gaap_PropertyPlantAndEquipmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

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