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Goodwill and Other Intangible Assets - Goodwill (Details)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2017
USD ($)
contract
Dec. 31, 2017
USD ($)
Segment
Dec. 25, 2016
USD ($)
Goodwill [Line Items]      
Number of operating segments | Segment   4  
Goodwill $ 461.2 $ 461.2 $ 485.4
Intangible assets, net $ 22.0 22.0 32.6
Number of lost contract opportunities | contract 2    
Lost contract opportunities period 5 years    
Carrying amounts of goodwill by reportable segment      
Gross value $ 732.8 732.8 732.8
Less accumulated impairment 271.6 271.6 247.4
Net 461.2 461.2 485.4
Public Safety & Security      
Goodwill [Line Items]      
Goodwill 35.6 35.6 35.6
Carrying amounts of goodwill by reportable segment      
Gross value 53.9 53.9 53.9
Less accumulated impairment 18.3 18.3 18.3
Net 35.6 35.6 35.6
Kratos Unmanned Systems (US)      
Goodwill [Line Items]      
Goodwill 97.3 97.3 97.3
Carrying amounts of goodwill by reportable segment      
Gross value 111.1 111.1 111.1
Less accumulated impairment 13.8 13.8 13.8
Net 97.3 97.3 97.3
Kratos Government Solutions (KGS)      
Goodwill [Line Items]      
Impairment of goodwill 24.2 24.2  
Goodwill 328.3 328.3 352.5
Carrying amounts of goodwill by reportable segment      
Gross value 567.8 567.8 567.8
Less accumulated impairment 239.5 239.5 215.3
Net $ 328.3 $ 328.3 $ 352.5