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Pension and Other Postretirement Benefit Plans - Anticipated Cash Contributions (Details) $ in Thousands	12 Months Ended
	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

X

- Definition

Expected Pension Contributions

+ References

No definition available.

+ Details

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Namespace Prefix:	jec_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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

X

- Details

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

X

- Details

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