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Segment Information (Narrative) (Details)	3 Months Ended
	Apr. 01, 2016 Business
Segment Reporting [Abstract]
Number of operating and reporting structure of business	4

X

- Definition

Number of operating and reporting structure of business.

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

Name:	us-gaap_SegmentReportingAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration