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Goodwill and Intangibles - Narrative (Details) - USD ($) $ in Millions | Dec. 28, 2018 | Dec. 29, 2017
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CH2M HILL Companies, Ltd. |  |
Finite-Lived Intangible Assets [Line Items] |  |
Lease intangible liabilities | $ 8.4 | $ 9.6

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- Definition Lease intangible liabilities. + References No definition available. + Details
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Namespace Prefix: | jec_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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

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- Details
Name: | us-gaap_BusinessAcquisitionAxis=jec_CH2MHILLCompaniesLimitedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |