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Goodwill and Other Intangible Assets - Goodwill (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 30, 2018 USD ($) contract | Dec. 31, 2017 USD ($) | Dec. 30, 2018 USD ($) Segment | Dec. 31, 2017 USD ($)
Goodwill [Line Items] |  |  |  |
Number of operating segments | Segment |  |  | 4 |
Goodwill | $ 425.7 | $ 425.7 | $ 425.7 | $ 425.7
Number of lost contract opportunities | contract | 2 |  |  |
Lost contract opportunities period | 5 years |  |  |
Carrying amounts of goodwill by reportable segment |  |  |  |
Gross value | $ 679.0 |  | 679.0 |
Less accumulated impairment | 253.3 |  | 253.3 |
Net | 425.7 | 425.7 | 425.7 | 425.7
Kratos Unmanned Systems (US) |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill | 97.3 |  | 97.3 |
Carrying amounts of goodwill by reportable segment |  |  |  |
Gross value | 111.1 |  | 111.1 |
Less accumulated impairment | 13.8 |  | 13.8 |
Net | 97.3 |  | 97.3 |
Kratos Government Solutions (KGS) |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill | 328.4 |  | 328.4 |
Impairment of goodwill |  | $ 24.2 |  | $ 24.2
Carrying amounts of goodwill by reportable segment |  |  |  |
Gross value | 567.9 |  | 567.9 |
Less accumulated impairment | 239.5 |  | 239.5 |
Net | $ 328.4 |  | $ 328.4 |

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