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Leases (Narrative) (Details) - USD ($) $ in Millions | Sep. 27, 2020 | Jul. 31, 2020 | Apr. 30, 2020
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Property Subject to or Available for Operating Lease [Line Items] |  |  |
Lease term (in years) | 20 years |  |
Amount of rent deferred under temporary rent concessions |  | $ 15.5 |
Lease liabilities subject to accretion | $ 947.8 |  |
Lease liability related to rent deferrals | 7.2 |  |
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 |  |  | $ 9.1
Rent concessions secured for landlords passed on to franchisees |  | $ 5.6 |
Uncollected rent concessions | $ 2.6 |  |
Minimum |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |
Lease renewal option as lessor (in years) | 1 year |  |
Minimum | Restaurant and Office Equipment |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |
Lease term (in years) | 3 years |  |
Maximum |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |
Lease renewal option as lessor (in years) | 20 years |  |
Maximum | Restaurant and Office Equipment |  |  |
Property Subject to or Available for Operating Lease [Line Items] |  |  |
Lease term (in years) | 8 years |  |

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- Definition Lessee, Lease Liabilities, Deferred + References No definition available. + Details
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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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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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Data Type: | xbrli:monetaryItemType
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- Definition Lessor, Lease Receivables Deferred + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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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
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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- Definition Lessor, Rent Concession Deferrals Passed Through to Lessees + 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 Term of lessor'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 30 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=119202524&loc=SL77919359-209981 + Details
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- Definition Term of lessor'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 30 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=119202524&loc=SL77919359-209981 + Details
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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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- Details
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Namespace Prefix: |
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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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