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Acquisition - Pro Forma Financial Information (Details) - USD ($) $ / shares in Thousands, $ in Millions | 3 Months Ended
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Mar. 31, 2019 | Apr. 01, 2018
Business Acquisition [Line Items] |  |
Pro forma net income attributable to Kratos | $ 3.1 | $ (2.2)
FTT |  |
Business Acquisition [Line Items] |  |
Pro forma revenues | 168.5 |
Pro forma net income before tax | 1.3 |
Pro forma net income | 2.2 |
Pro forma net income attributable to Kratos | $ 2.4 |
Basic pro forma income per share attributable to Kratos (USD per share) | $ 20 |
Diluted pro forma income per share attributable to Kratos (USD per share) | $ 20 |

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