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Business Combinations - Pro Forma Information (Details) - KeyW
$ / shares in Units, $ in Millions
6 Months Ended
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