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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 | 12 Months Ended
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Oct. 01, 2021 | Oct. 02, 2020
Business Acquisition [Line Items] |  |
Revenues | $ 14,504.3 | $ 14,348.1
Net earnings of the Group | 695.1 | 83.5
Net earnings attributable to Jacobs | $ 548.0 | $ 138.6
Net earnings attributable to Jacobs per share: |  |
Basic earnings (loss) per share (in dollars per share) | $ 4.21 | $ 0.62
Diluted earnings (loss) per share (in dollars per share) | $ 4.17 | $ 0.61
Business acquisitions pro forma income tax expense (benefit) | $ (330.7) | $ (13.5)

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