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New Accounting Standards (Details) - ASU 2015-17 $ in Millions	Oct. 02, 2015 USD ($)
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Increase in noncurrent deferred tax assets	$ 160.3
Decrease in miscellaneous assets noncurrent	$ 213.8

X

- Definition

New accounting pronouncement or change in accounting principle retrospective effect of decrease in miscellaneous noncurrent assets.

+ References

No definition available.

+ Details

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Namespace Prefix:	jec_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

New accounting pronouncement or change in accounting principle retrospective effect of increase in noncurrent deferred tax assets.

+ References

No definition available.

+ Details

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

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: