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Business Combinations Business Combinations - Pro Forma Information (Details) - KeyW Holding Corporation - USD ($) | 9 Months Ended
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Jun. 28, 2019 | Jun. 29, 2018
Business Acquisition [Line Items] |  |
Revenues | $ 9,562,000.0 | $ 7,969,000.0
Net earnings of the Group | 290,800 | 68,900
Net earnings (loss) attributable to Jacobs | $ 275,300 | $ 63,300
Basic earnings (loss) per share | $ 1.98 | $ 0.47
Diluted earnings (loss) per share | $ 1.96 | $ 0.46

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- Definition Amount after tax of pro forma income from continuing operations as if the business combination had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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