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Business Combinations - Summary of Unaudited Proforma Operating Results (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
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Sep. 27, 2019 | Sep. 28, 2018
KeyW Holding Corporation |  |
Business Acquisition [Line Items] |  |
Revenues | $ 13,068.7 |
Net earnings | 326.0 |
Net earnings (loss) attributable to Jacobs | $ 303.0 |
Net earnings (loss) attributable to Jacobs per share: |  |
Basic earnings (loss) per share (in dollars per share) | $ 2.19 |
Diluted earnings (loss) per share (in dollars per share) | $ 2.17 |
Business acquisitions pro forma income tax expense (benefit) | $ 41.3 |
CH2M HILL Companies, Ltd. |  |
Business Acquisition [Line Items] |  |
Revenues |  | $ 16,012.4
Net earnings |  | 196.3
Net earnings (loss) attributable to Jacobs |  | $ 184.5
Net earnings (loss) attributable to Jacobs per share: |  |
Basic earnings (loss) per share (in dollars per share) |  | $ 1.28
Diluted earnings (loss) per share (in dollars per share) |  | $ 1.27
Business acquisitions pro forma income tax expense (benefit) |  | $ 409.7

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