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Acquisitions - Pro Forma Financial Information (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 26, 2021
Dec. 27, 2020
Dec. 29, 2019
Business Acquisition [Line Items]      
Pro forma net income attributable to Kratos $ (2.0) $ 79.6 $ 12.5
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
Pro forma net income attributable to Kratos     $ 11.8
Basic pro forma income per share attributable to Kratos (in dollars per share)     $ 0.11
Diluted pro forma income per share attributable to Kratos (in dollars per share)     $ 0.11
CPI ASC Signal Division, Inc.      
Business Acquisition [Line Items]      
Pro forma revenues   766.0  
Pro forma net income before tax   2.6  
Pro forma net income   $ 74.5  
Basic pro forma income per share attributable to Kratos (in dollars per share)   $ 0.65  
Diluted pro forma income per share attributable to Kratos (in dollars per share)   $ 0.63  
Valuation allowance   $ 80.1