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Goodwill and Other Intangible Assets - Goodwill (Details) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 29, 2019 USD ($) contract | Dec. 29, 2019 USD ($) Segment | Dec. 31, 2017 USD ($) | Dec. 30, 2018 USD ($)
Goodwill [Line Items] |  |  |  |
Number of operating segments | Segment |  | 5 |  |
Goodwill | $ 455.6 | $ 455.6 |  | $ 425.7
Number of lost contract opportunities | contract | 2 |  |  |
Lost contract opportunities period | 5 years |  |  |
Carrying amounts of goodwill by reportable segment |  |  |  |
Gross value | $ 708.9 | 708.9 |  | 679.0
Less accumulated impairment | 253.3 | 253.3 |  | 253.3
Net | 455.6 | 455.6 |  | 425.7
Kratos Unmanned Systems (US) |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill | 97.3 | 97.3 |  | 97.3
Carrying amounts of goodwill by reportable segment |  |  |  |
Gross value | 111.1 | 111.1 |  | 111.1
Less accumulated impairment | 13.8 | 13.8 |  | 13.8
Net | 97.3 | 97.3 |  | 97.3
Kratos Government Solutions (KGS) |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill | 358.3 | 358.3 |  | 328.4
Impairment of goodwill |  |  | $ 24.2 |
Carrying amounts of goodwill by reportable segment |  |  |  |
Gross value | 597.8 | 597.8 |  | 567.9
Less accumulated impairment | 239.5 | 239.5 |  | 239.5
Net | $ 358.3 | $ 358.3 |  | $ 328.4

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