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Business Combinations - Summary of Unaudited Proforma Operating Results (Details) - CH2M HILL Companies, Ltd. - USD ($) $ / shares in Units, $ in Millions | 9 Months Ended
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Jun. 29, 2018 | Jun. 30, 2017
Business Acquisition [Line Items] |  |
Revenues | $ 11,869.8 | $ 10,709.9
Net earnings | 226.1 | 130.8
Net earnings (loss) attributable to Jacobs | $ 222.1 | $ 112.7
Net earnings (loss) attributable to Jacobs per share: |  |
Basic earnings (loss) per share (in dollars per share) | $ 1.56 | $ 0.80
Diluted earnings (loss) per share (in dollars per share) | $ 1.55 | $ 0.80
Business acquisitions pro forma income tax expense (benefit) | $ 180.4 | $ (14.9)

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