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Business Combinations - Summary of Unaudited Proforma Operating Results (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Sep. 27, 2019	Sep. 28, 2018
KeyW Holding Corporation
Business Acquisition [Line Items]
Revenues	$ 13,068.7	$ 11,087.2
Net earnings	326.0	2.8
Net earnings (loss) attributable to Jacobs	$ 303.0	$ (6.7)
Net earnings (loss) attributable to Jacobs per share:
Basic earnings (loss) per share (in dollars per share)	$ 2.19	$ (0.05)
Diluted earnings (loss) per share (in dollars per share)	$ 2.17	$ (0.05)
Business acquisitions pro forma income tax expense (benefit)	$ 41.3	$ 305.7
CH2M HILL Companies, Ltd.
Business Acquisition [Line Items]
Revenues		16,012.4
Net earnings		196.3
Net earnings (loss) attributable to Jacobs		$ 184.5
Net earnings (loss) attributable to Jacobs per share:
Basic earnings (loss) per share (in dollars per share)		$ 1.28
Diluted earnings (loss) per share (in dollars per share)		$ 1.27
Business acquisitions pro forma income tax expense (benefit)		$ 409.7

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