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Subsequent Events (Details) $ / shares in Units, $ in Millions |  | 4 Months Ended | 6 Months Ended
--- | --- | --- | ---
Feb. 19, 2018 $ / shares | Jan. 21, 2018 restaurant $ / shares | Jan. 22, 2017 restaurant $ / shares | Apr. 15, 2018 USD ($)
Subsequent Event [Line Items] |  |  |  |
Cash dividends declared per common share | $ / shares |  | $ 0.40 | $ 0.40 |
Number of Restaurants | restaurant |  | 2,250 | 2,261 |
Subsequent Event |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Cash dividends declared per common share | $ / shares | $ 0.40 |  |  |
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Number of Restaurants |  |  |  | 50
Minimum [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Estimated Pre-Tax Proceeds from Sale to Franchisees | $ |  |  |  | $ 25.0
Maximum [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Estimated Pre-Tax Proceeds from Sale to Franchisees | $ |  |  |  | $ 27.0

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- Definition Estimated Pre-Tax Proceeds from Sale to Franchisees + References No definition available. + Details
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Namespace Prefix: | jack_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the number of restaurants. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration

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

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

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

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