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Goodwill and Intangibles - Narrative (Details) - USD ($) $ in Thousands | Mar. 27, 2020 | Sep. 27, 2019
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Finite-Lived Intangible Assets [Line Items] |  |
Unamortized acquired intangible assets | $ 689,795 | $ 665,076

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- Definition Finite-Lived Intangible Assets, Net, Acquired As Part Of Business Combination + References No definition available. + Details
Name: | jec_FiniteLivedIntangibleAssetsNetAcquiredAsPartOfBusinessCombination
Namespace Prefix: | jec_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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