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Leases (Details) $ in Thousands | Apr. 12, 2020 USD ($)
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Lessee, Lease, Description [Line Items] |
Initial term of operating lease | 20 years
Amount of rent deferred under temporary rent concessions | $ 13,400
Lease liabilities subject to accretion | 940,000
Lease liabilities related to April rent deferrals | $ 4,800
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 | $ 9,100
Rent concessions secured from landlords passed on to franchisees | $ 10,400
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 Lessee, Lease Liabilities, Deferred + References No definition available. + Details
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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
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- Definition Lessee, Temporary Rent Concession, Deferral of Payment + References No definition available. + Details
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Namespace Prefix: | jack_
Data Type: | xbrli:monetaryItemType
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- Definition Lessor, Portion of Monthly Rent Postponed, Amount + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition Lessor, Portion of Monthly Rent Postponed, Percent + References No definition available. + Details
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Data Type: | num:percentItemType
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- Definition Lessor, Rent Concession Deferrals Passed Through to Lessees + References No definition available. + Details
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Namespace Prefix: | jack_
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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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- 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
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- Details
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Namespace Prefix: |
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Balance Type: |
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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