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Revenue Accounting for Contracts / Accounting for Joint Ventures (Subcontractor Costs) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
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Mar. 28, 2014 | Mar. 29, 2013 | Mar. 28, 2014 | Mar. 29, 2013
Revenue Accounting for Contracts / Accounting for Joint Ventures [Abstract] |  |  |  |
Pass-through costs included in revenues | $ 700,558 | $ 573,617 | $ 1,452,581 | $ 1,120,033

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Period Type: | duration

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- Details
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Namespace Prefix: | jec_
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