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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
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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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