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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jul. 01, 2018 | Jun. 25, 2017 | Jul. 01, 2018 | Jun. 25, 2017
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | $ 151.2 | $ 147.9 | $ 294.2 | $ 279.9
Kratos Government Solutions |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 115.6 |  | 230.8 |
Kratos Government Solutions | U.S. Government |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 72.1 |  | 143.0 |
Kratos Government Solutions | International |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 29.0 |  | 55.9 |
Kratos Government Solutions | U.S. Commercial and other customers |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 14.5 |  | 31.9 |
Kratos Government Solutions | Fixed price |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 101.5 |  | 203.3 |
Kratos Government Solutions | Cost plus fee |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 7.2 |  | 14.4 |
Kratos Government Solutions | Time and materials |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 6.9 |  | 13.1 |
Unmanned Systems |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 35.6 |  | 63.4 |
Unmanned Systems | U.S. Government |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 28.9 |  | 53.0 |
Unmanned Systems | International |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 6.6 |  | 10.3 |
Unmanned Systems | U.S. Commercial and other customers |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 0.1 |  | 0.1 |
Unmanned Systems | Fixed price |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 29.1 |  | 51.0 |
Unmanned Systems | Cost plus fee |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 5.9 |  | 11.4 |
Unmanned Systems | Time and materials |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | $ 0.6 |  | $ 1.0 |

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