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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. 25, 2016 | Sep. 25, 2016 | Jun. 26, 2016 | Mar. 27, 2016 | Dec. 31, 2017 | Dec. 25, 2016 | Dec. 27, 2015 | May 31, 2014
Effect of Fourth Quarter Events [Line Items] |  |  |  |  |  |  |  |  |  |
Loss (gain) on extinguishment of debt |  |  |  |  |  |  | $ 17.3 | $ (0.2) | $ 3.4 |
Restructuring charges |  |  |  |  |  |  | 0.0 | $ 9.1 | $ 0.0 |
Loss on contract |  |  |  | $ 18.7 |  |  |  |  |  |
Facility Closure |  |  |  |  |  |  |  |  |  |
Effect of Fourth Quarter Events [Line Items] |  |  |  |  |  |  |  |  |  |
Restructuring charges |  |  | $ 1.4 | $ 0.1 | $ 4.7 | $ 3.0 |  |  |  |
Kratos Government Solutions (KGS) |  |  |  |  |  |  |  |  |  |
Effect of Fourth Quarter Events [Line Items] |  |  |  |  |  |  |  |  |  |
Impairment of goodwill |  | $ 24.2 |  |  |  |  | 24.2 |  |  |
Senior notes | 7% Senior Notes due 2019 |  |  |  |  |  |  |  |  |  |
Effect of Fourth Quarter Events [Line Items] |  |  |  |  |  |  |  |  |  |
Loss (gain) on extinguishment of debt | $ 3.4 | $ 15.2 | $ (0.2) |  |  |  | $ 17.3 |  |  |
Stated interest rate |  | 7.00% |  |  |  |  | 7.00% |  |  | 7.00%

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