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Acquisition - Pro Forma Financial Information (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Dec. 29, 2019
Sep. 29, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 29, 2019
Dec. 30, 2018
Dec. 31, 2017
Business Acquisition [Line Items]              
Net income (loss) $ 3.0 $ 2.5 $ 3.9 $ 3.1 $ 12.5 $ (3.5) $ (42.7)
FTT Inc              
Business Acquisition [Line Items]              
Pro forma revenues         725.6    
Pro forma net income before tax         14.8    
Pro forma net income         11.7    
Net income (loss)         $ 11.8    
Basic pro forma income per share attributable to Kratos (in shares)         $ 0.11    
Diluted pro forma income per share attributable to Kratos (in shares)         $ 0.11