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Business Combinations - Summary of Unaudited Proforma Operating Results (Details) - CH2M HILL Companies, Ltd. - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
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Sep. 28, 2018 | Sep. 29, 2017
Business Acquisition [Line Items] |  |
Revenues | $ 16,012.4 | $ 14,612.4
Net earnings | 196.3 | 264.8
Net earnings (loss) attributable to Jacobs | $ 184.5 | $ 243.6
Net earnings (loss) attributable to Jacobs per share: |  |
Basic earnings (loss) per share (in dollars per share) | $ 1.28 | $ 1.73
Diluted earnings (loss) per share (in dollars per share) | $ 1.27 | $ 1.72
Business acquisitions pro forma income tax expense (benefit) | $ 409.7 | $ 24.2

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