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PA Consulting Business Combinations - Summary of Unaudited Proforma Operating Results (Details) - PA Consulting Group Limited $ / shares in Units, $ in Millions | 6 Months Ended
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Apr. 02, 2021 USD ($) $ / shares
Business Acquisition [Line Items] |
Revenues | $ 7,341.4
Net earnings (loss) of the Group | 449.9
Net earnings attributable to Jacobs | $ 337.7
Net earnings (loss) attributable to Jacobs per share: |
Basic earnings (loss) per share (in dollars per share) | $ / shares | $ 2.60
Diluted earnings (loss) per share (in dollars per share) | $ / shares | $ 2.58
Business acquisitions pro forma income tax expense (benefit) | $ (122.1)

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