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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
6 Months Ended
Apr. 02, 2021
Mar. 27, 2020
Business Acquisition [Line Items]    
Revenues $ 7,341.4 $ 7,184.9
Net earnings of the Group 449.9 (238.0)
Net earnings (loss) attributable to Jacobs $ 337.7 $ (157.0)
Net earnings (loss) attributable to Jacobs per share:    
Basic earnings (loss) per share (in dollars per share) $ 2.60 $ (1.18)
Diluted earnings (loss) per share (in dollars per share) $ 2.58 $ (1.17)
Business acquisitions pro forma income tax expense (benefit) $ (122.1) $ 44.9