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Pension and Other Post Retirement Benefit Plans - Narrative (Details)	12 Months Ended
	Sep. 27, 2024
U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Period of annual average returns used in return on plan assets simulation model (in years)	20 years

X

- Definition

Defined Benefit Plan Period Of Annual Average Returns Used In Return On Plan Assets Simulation Model

+ References

No definition available.

+ Details

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Namespace Prefix:	jec_
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Balance Type:	na
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: