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Significant Customers (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 25, 2016 | Dec. 27, 2015
Revenue, Major Customer [Line Items] |  |  |
Sales to the U.S. Government - amount | $ 751.9 | $ 668.7 | $ 657.1
U.S. Government | Kratos Government Solutions (KGS) |  |  |
Revenue, Major Customer [Line Items] |  |  |
Sales to the U.S. Government - amount | $ 452.8 | $ 398.3 | $ 402.9
Sales to the U.S. Government - percentage of total revenue | 60.00% | 60.00% | 61.00%

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