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Revenue Accounting for Contracts / Accounting for Joint Ventures (Subcontractor Costs) (Details) - USD ($) $ in Thousands	3 Months Ended
	Jan. 01, 2016	Dec. 26, 2014
Revenue Accounting for Contracts / Accounting for Joint Ventures [Abstract]
Pass-through costs included in revenues	$ 670,331	$ 706,830

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- Definition

Pass-through Cost

+ References

No definition available.

+ Details

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Namespace Prefix:	jec_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

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

+ References

No definition available.

+ Details

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Namespace Prefix:	jec_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration