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PA Consulting Business Combinations - Summary of Unaudited Proforma Operating Results (Details) - PA Consulting Group Limited - USD ($) $ / shares in Units, $ in Millions	9 Months Ended
	Jul. 02, 2021	Jun. 26, 2020
Business Acquisition [Line Items]
Revenues	$ 10,917.8	$ 10,634.6
Net earnings (loss) of the Group	624.1	(8.1)
Net earnings attributable to Jacobs	$ 503.2	$ 63.7
Net earnings (loss) attributable to Jacobs per share:
Basic earnings (loss) per share (in dollars per share)	$ 3.86	$ 0.05
Diluted earnings (loss) per share (in dollars per share)	$ 3.83	$ 0.05
Business acquisitions pro forma income tax expense (benefit)	$ (231.3)	$ (29.5)

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