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Business Combinations - Pro Forma Information (Details) - KeyW Holding Corporation | 3 Months Ended
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Dec. 28, 2018 USD ($) $ / shares
Business Acquisition [Line Items] |
Revenues | $ 3,210,100
Net earnings of the Group | 69,000.0
Net earnings (loss) attributable to Jacobs | $ 64,500
Basic earnings (loss) per share | $ / shares | $ 0.45
Diluted earnings (loss) per share | $ / shares | $ 0.45

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