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Acquisition - Pro Forma Financial Information (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 29, 2019 | Sep. 29, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 29, 2019 | Dec. 30, 2018 | Dec. 31, 2017
Business Acquisition [Line Items] |  |  |  |  |  |  |
Net income (loss) | $ 3.0 | $ 2.5 | $ 3.9 | $ 3.1 | $ 12.5 | $ (3.5) | $ (42.7)
FTT Inc |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Pro forma revenues |  |  |  |  | 725.6 |  |
Pro forma net income before tax |  |  |  |  | 14.8 |  |
Pro forma net income |  |  |  |  | 11.7 |  |
Net income (loss) |  |  |  |  | $ 11.8 |  |
Basic pro forma income per share attributable to Kratos (in shares) |  |  |  |  | $ 0.11 |  |
Diluted pro forma income per share attributable to Kratos (in shares) |  |  |  |  | $ 0.11 |  |

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