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Goodwill and Intangibles - Narrative (Details) - USD ($) $ in Millions	Dec. 27, 2019	Dec. 28, 2018
CH2M HILL Companies, Ltd.
Finite-Lived Intangible Assets [Line Items]
Lease intangible liabilities	$ 3.8	$ 4.7

X

- 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

X

- 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

X

- Details

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