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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 25, 2022
Sep. 26, 2021
Sep. 25, 2022
Sep. 26, 2021
Disaggregation of Revenue [Line Items]        
Total Revenues $ 228.6 $ 200.6 $ 649.0 $ 599.9
Kratos Government Solutions        
Disaggregation of Revenue [Line Items]        
Total Revenues 178.6 139.3 490.0 422.4
Kratos Government Solutions | U.S. Government        
Disaggregation of Revenue [Line Items]        
Total Revenues 114.6 86.4 308.3 270.8
Kratos Government Solutions | International        
Disaggregation of Revenue [Line Items]        
Total Revenues 39.8 34.9 110.6 102.4
Kratos Government Solutions | U.S. Commercial and other customers        
Disaggregation of Revenue [Line Items]        
Total Revenues 24.2 18.0 71.1 49.2
Kratos Government Solutions | Fixed price        
Disaggregation of Revenue [Line Items]        
Total Revenues 125.1 109.8 346.3 316.4
Kratos Government Solutions | Cost plus fee        
Disaggregation of Revenue [Line Items]        
Total Revenues 43.3 19.6 112.7 76.2
Kratos Government Solutions | Time and materials        
Disaggregation of Revenue [Line Items]        
Total Revenues 10.2 9.9 31.0 29.8
Unmanned Systems        
Disaggregation of Revenue [Line Items]        
Total Revenues 50.0 61.3 159.0 177.5
Unmanned Systems | U.S. Government        
Disaggregation of Revenue [Line Items]        
Total Revenues 43.5 57.3 145.5 161.3
Unmanned Systems | International        
Disaggregation of Revenue [Line Items]        
Total Revenues 5.9 3.6 11.3 15.4
Unmanned Systems | U.S. Commercial and other customers        
Disaggregation of Revenue [Line Items]        
Total Revenues 0.6 0.4 2.2 0.8
Unmanned Systems | Fixed price        
Disaggregation of Revenue [Line Items]        
Total Revenues 33.6 41.2 105.8 114.8
Unmanned Systems | Cost plus fee        
Disaggregation of Revenue [Line Items]        
Total Revenues 14.9 19.6 50.6 60.9
Unmanned Systems | Time and materials        
Disaggregation of Revenue [Line Items]        
Total Revenues $ 1.5 $ 0.5 $ 2.6 $ 1.8