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Pension and Other Postretirement Benefit Plans - Anticipated Cash Contributions (Details) - Pension Plan $ in Thousands	12 Months Ended
	Oct. 01, 2021 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	$ 24,820

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- 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

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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

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

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- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RetirementPlanSponsorLocationAxis=country_US
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RetirementPlanSponsorLocationAxis=us-gaap_ForeignPlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: