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Business Combinations - Summary of Unaudited Proforma Operating Results (Details) - CH2M HILL Companies, Ltd. $ / shares in Units, $ in Millions | 6 Months Ended
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Mar. 30, 2018 USD ($) $ / shares
Business Acquisition [Line Items] |
Revenues | $ 7,713.1
Net earnings of the Group | 77.7
Net earnings (loss) attributable to Jacobs | $ 71.8
Net earnings (loss) attributable to Jacobs per share: |
Basic earnings (loss) per share (in dollars per share) | $ / shares | $ 0.50
Diluted earnings (loss) per share (in dollars per share) | $ / shares | $ 0.50
Business acquisitions pro forma income tax expense (benefit) | $ 137.7

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