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PA Consulting Business Combinations - Summary of Unaudited Proforma Operating Results (Details) - PA Consulting Group Limited $ / shares in Units, $ in Millions	3 Months Ended
	Jan. 01, 2021 USD ($) $ / shares
Business Acquisition [Line Items]
Revenues	$ 3,632.7
Net earnings (loss) of the Group	282.1
Net earnings attributable to Jacobs	$ 264.6
Net earnings (loss) attributable to Jacobs per share:
Basic earnings (loss) per share (in dollars per share) | $ / shares	$ 2.04
Diluted earnings (loss) per share (in dollars per share) | $ / shares	$ 2.02
Business acquisitions pro forma income tax expense (benefit)	$ 76.7

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