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Borrowings (Schedule Of Other Loan Agreements) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2011	Oct. 01, 2010
Borrowings
Maximum amount outstanding at any month-end during the fiscal year	$ 675,083	$ 117,482
Average amount outstanding during the year	$ 403,649	$ 84,018
Weighted average interest rate during the year	1.81%	1.29%

X

- Definition

Line Of Credit Weighted Average Interest Rate

+ Details

Name:	jec_LineOfCreditWeightedAverageInterestRate
Namespace Prefix:	jec
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_DebtDisclosureAbstract
Namespace Prefix:	us-gaap
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Average amount borrowed under the credit facility during the period.

+ Details

Name:	us-gaap_LineOfCreditFacilityAverageOutstandingAmount
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Maximum month-end amount borrowed under the credit facility during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Industry Guide

-Number 3

-Section VII

-Subsection 2

+ Details

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Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration