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Borrowings (Schedule Of Other Loan Agreements) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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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%

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- 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

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

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- 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

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