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Segment Information (Details)	3 Months Ended	6 Months Ended
	Jan. 01, 2016 Segment	Apr. 01, 2016 Business
Segment Reporting [Abstract]
Number of operating and reporting structure of business | Business		4
Number of reportable segments | Segment	1

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

- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfReportableSegments
Namespace Prefix:	us-gaap_
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