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Business Combinations - Summary of Unaudited Proforma Operating Results (Details) - CH2M HILL Companies, Ltd. $ / shares in Units, $ in Millions	9 Months Ended
	Jun. 29, 2018 USD ($) $ / shares
Business Acquisition [Line Items]
Revenues	$ 11,869.8
Net earnings of the Group	226.1
Net earnings (loss) attributable to Jacobs	$ 222.1
Net earnings (loss) attributable to Jacobs per share:
Basic earnings (loss) per share | $ / shares	$ 1.56
Diluted earnings (loss) per share | $ / shares	$ 1.55
Business acquisitions pro forma income tax expense (benefit)	$ 180.4

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