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Indebtedness (Scheduled Principal Payments of Long-Term Debt) (Details) - USD ($) $ in Thousands | Sep. 27, 2020 | Sep. 29, 2019
--- | --- | ---
Debt Disclosure [Abstract] |  |
2021 | $ 818 |
2022 | 844 |
2023 | 571,558 |
2024 | 351 |
2025 | 28 |
Thereafter | 827,462 |
Total debt | $ 1,401,061 | $ 1,303,594

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- Definition Long-term Debt and Lease Obligations, Maturities, Repayments of Principal after Year Five + References No definition available. + Details
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Balance Type: | credit
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- Definition Long-term Debt and Lease Obligations, Maturities, Repayments of Principal in Year Five + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition Long-term Debt and Lease Obligations, Maturities, Repayments of Principal in Year Four + References No definition available. + Details
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Namespace Prefix: | jack_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Long-term Debt and Lease Obligations, Maturities, Repayments of Principal in Year Three + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition Long-term Debt and Lease Obligations, Maturities, Repayments of Principal in Year Two + References No definition available. + Details
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Namespace Prefix: | jack_
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Balance Type: | credit
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- Definition Long-term Debt and Lease Obligations, Repayments of Principal in Next Twelve Months + References No definition available. + Details
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- Definition Long-term Debt, Gross And Lease Obligation + 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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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration