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

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