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Business Combinations (Pro-forma Results) (Details) (Sinclair Knight Merz [Member], USD $) In Millions, except Per Share data, unless otherwise specified | 6 Months Ended
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Mar. 28, 2014 | Mar. 29, 2013
Pro Forma Results [Abstract] |  |
Revenues | $ 6,495 | $ 6,328
Net earnings attributable to Jacobs | 183.0 | 220.0
Basic earnings per share (in dollars per share) | $ 1.40 | $ 1.71
Diluted earnings per share (in dollars per share) | $ 1.38 | $ 1.69
Acquisition-related Costs [Member] |  |
Pro Forma Results [Abstract] |  |
Net earnings attributable to Jacobs | $ 21.1 | $ (22.7)

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