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v3.8.0.1

Segment Information (Narrative) (Details) | 3 Months Ended
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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
Name: | jec_NumberOfOperatingAndReportingStructureOfBusiness
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