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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2019
Apr. 01, 2018
Disaggregation of Revenue [Line Items]    
Total Revenues $ 160.4 $ 143.0
Kratos Government Solutions    
Disaggregation of Revenue [Line Items]    
Total Revenues 125.5 115.2
Kratos Government Solutions | U.S. Government    
Disaggregation of Revenue [Line Items]    
Total Revenues 86.8 76.8
Kratos Government Solutions | International    
Disaggregation of Revenue [Line Items]    
Total Revenues 24.9 21.0
Kratos Government Solutions | U.S. Commercial and other customers    
Disaggregation of Revenue [Line Items]    
Total Revenues 13.8 17.4
Kratos Government Solutions | Fixed price    
Disaggregation of Revenue [Line Items]    
Total Revenues 109.1 101.8
Kratos Government Solutions | Cost plus fee    
Disaggregation of Revenue [Line Items]    
Total Revenues 9.2 7.2
Kratos Government Solutions | Time and materials    
Disaggregation of Revenue [Line Items]    
Total Revenues 7.2 6.2
Unmanned Systems    
Disaggregation of Revenue [Line Items]    
Total Revenues 34.9 27.8
Unmanned Systems | U.S. Government    
Disaggregation of Revenue [Line Items]    
Total Revenues 30.1 24.2
Unmanned Systems | International    
Disaggregation of Revenue [Line Items]    
Total Revenues 4.5 3.6
Unmanned Systems | U.S. Commercial and other customers    
Disaggregation of Revenue [Line Items]    
Total Revenues 0.3 0.0
Unmanned Systems | Fixed price    
Disaggregation of Revenue [Line Items]    
Total Revenues 27.2 21.9
Unmanned Systems | Cost plus fee    
Disaggregation of Revenue [Line Items]    
Total Revenues 7.4 5.5
Unmanned Systems | Time and materials    
Disaggregation of Revenue [Line Items]    
Total Revenues $ 0.3 $ 0.4