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Quarterly Financial Data (Unaudited) (Details) - USD ($) $ in Millions |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 22, 2015 | Dec. 31, 2017 | Dec. 30, 2018 | Dec. 31, 2017 | Dec. 25, 2016 | May 31, 2014
Effect of Fourth Quarter Events [Line Items] |  |  |  |  |  |
Loss (gain) on extinguishment of debt |  |  | $ 0.0 | $ 17.3 | $ (0.2) |
Senior notes | 7% Senior Notes due 2019 |  |  |  |  |  |
Effect of Fourth Quarter Events [Line Items] |  |  |  |  |  |
Loss (gain) on extinguishment of debt | $ 3.4 | $ 15.2 |  | 17.3 | $ (0.2) |
Stated interest rate |  |  | 7.00% |  |  | 7.00%
Kratos Government Solutions (KGS) |  |  |  |  |  |
Effect of Fourth Quarter Events [Line Items] |  |  |  |  |  |
Impairment of goodwill |  | $ 24.2 |  | $ 24.2 |  |

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