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Revenue Accounting for Contracts / Accounting for Joint Ventures (Subcontractor Costs) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 26, 2015	Jun. 27, 2014	Jun. 26, 2015	Jun. 27, 2014
Revenue Accounting for Contracts / Accounting for Joint Ventures [Abstract]
Pass-through costs included in revenues	$ 574,350	$ 700,294	$ 1,896,516	$ 2,152,875

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- Definition

Pass-through Cost

+ References

No definition available.

+ Details

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X

- Definition

Revenue Accounting for Contracts / Accounting for Joint Ventures [Abstract]

+ References

No definition available.

+ Details

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Namespace Prefix:	jec_
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Balance Type:	na
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