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Pension and Other Postretirement Benefit Plans - Defined Contribution Plans (Details) $ in Thousands	9 Months Ended
	Jun. 30, 2023 USD ($)
Retirement Benefits [Abstract]
Cash contributions made during the first nine months of fiscal 2023	$ 19,334
Cash contributions projected for the remainder of fiscal 2023	7,317
Total	$ 26,651

X

- Definition

Expected contributions to funded pension plans.

+ References

No definition available.

+ Details

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Namespace Prefix:	jec_
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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

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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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