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Pension and Other Postretirement Benefit Plans - Schedule of Certain Information Regarding Cash Contributions (Details) $ in Thousands	6 Months Ended
	Mar. 28, 2025 USD ($)
Retirement Benefits [Abstract]
Cash contributions made during the first six months of fiscal 2025	$ 10,577
Cash contributions projected for the remainder of fiscal 2025	25,065
Total	$ 35,642

X

- Definition

Expected contributions to funded pension plans.

+ References

No definition available.

+ Details

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

X

- Definition

Expected Pension Contributions

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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

X

- Definition

Amount of cash outflow for pension benefit. Includes, but is not limited to, employer contribution to fund plan asset and payment to retiree. Excludes other postretirement benefit.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 25
-Subparagraph (g)
-SubTopic 10
-Topic 230
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-25

+ Details

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Period Type:	duration