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Segment Information - Narrative (Details) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 30, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jul. 01, 2018 USD ($) | Apr. 01, 2018 USD ($) | Dec. 31, 2017 USD ($) | Oct. 01, 2017 USD ($) | Jun. 25, 2017 USD ($) | Mar. 26, 2017 USD ($) | Oct. 01, 2017 Segment | Dec. 30, 2018 USD ($) Segment | Dec. 31, 2017 USD ($) | Dec. 25, 2016 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of reportable segments | Segment |  |  |  |  |  |  |  |  | 2 | 3 |  |
Total revenues | $ 164.4 | $ 159.4 | $ 151.2 | $ 143.0 | $ 166.3 | $ 157.1 | $ 147.9 | $ 132.0 |  | $ 618.0 | $ 603.3 | $ 541.9
Percentage of foreign revenue to total revenue (as a percent) |  |  |  |  |  |  |  |  |  | 19.00% | 14.00% | 15.00%
Unmanned Systems |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  |  | $ 132.9 |  |
Loss accrual |  |  |  |  |  |  |  |  |  |  |  | $ 18.7
Kratos Government Solutions |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  |  | 485.1 |  |
Impairment of goodwill |  |  |  |  | 24.2 |  |  |  |  |  | $ 24.2 |
Business exit costs |  |  |  |  |  |  |  |  |  |  |  | 9.2
Assets of foreign subsidiaries | $ 126.7 |  |  |  | $ 116.7 |  |  |  |  | 126.7 | 116.7 | 113.7
Non-US |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  |  | $ 114.3 | $ 84.7 | $ 80.1

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