XML 76 R47.htm IDEA: XBRL DOCUMENT v3.21.2

Description of Business and Basis of Presentation - Schedule of Percentage Revenues Realized by Contract (Details)	12 Months Ended
	Oct. 01, 2021	Oct. 02, 2020	Sep. 27, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Cost-reimbursable	76.00%	76.00%	76.00%
Fixed-price	24.00%	24.00%	24.00%

X

- Definition

Revenue From Cost Reimbursable Contracts Percentage

+ References

No definition available.

+ Details

Name:	jec_RevenueFromCostReimbursableContractsPercentage
Namespace Prefix:	jec_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Revenue From Fixed Price Contracts Percentage

+ References

No definition available.

+ Details

Name:	jec_RevenueFromFixedPriceContractsPercentage
Namespace Prefix:	jec_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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