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Pension Plans (Anticipated Cash Contributions) (Details) (USD $) In Thousands | 12 Months Ended
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Sep. 30, 2011
U.S. Pension Plans [Member] |
Anticipated cash contributions | $ 60,974
Non-U.S. Pension Plans [Member] |
Anticipated cash contributions | $ 48,345

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- Definition Expected pension contributions. + Details
Name: | jec_ExpectedPensionContributions
Namespace Prefix: | jec
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration