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Business Combinations - Pro Forma Information (Details) - KeyW $ / shares in Units, $ in Millions | 6 Months Ended
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Mar. 29, 2019 USD ($) $ / shares
Business Acquisition [Line Items] |
Revenues | $ 6,415.4
Net earnings of the Group | 189.0
Net earnings (loss) attributable to Jacobs | $ 179.4
Basic earnings (loss) per share (in dollars per share) | $ / shares | $ 1.28
Diluted earnings (loss) per share (in dollars per share) | $ / shares | $ 1.27

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