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Pension and Other Postretirement Benefit Plans - Anticipated Cash Contributions (Details) $ in Thousands | 12 Months Ended
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Sep. 27, 2019 USD ($)
U.S. Plans |
Defined Benefit Plan Disclosure [Line Items] |
Anticipated cash contributions | $ 0
Non-U.S. Plans |
Defined Benefit Plan Disclosure [Line Items] |
Anticipated cash contributions | $ 28,282

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- Definition Expected Pension Contributions + References No definition available. + Details
Name: | jec_ExpectedPensionContributions
Namespace Prefix: | jec_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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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_DefinedBenefitPlanDisclosureLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_RetirementPlanTypeAxis=us-gaap_PensionPlansDefinedBenefitMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RetirementPlanTypeAxis=us-gaap_OtherPensionPlansDefinedBenefitMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |