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Segment Information - Schedule of Segment Revenues, Depreciation and Amortization, and Operating (Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 28, 2021
Mar. 29, 2020
Segment Reporting Information [Line Items]    
Total revenues $ 194.2 $ 168.9
Depreciation & amortization:    
Total depreciation and amortization 6.3 6.3
Operating income from continuing operations:    
Total operating income from continuing operations 4.9 4.7
Corporate activities    
Operating income from continuing operations:    
Total operating income from continuing operations (6.4) (5.1)
Kratos Government Solutions    
Segment Reporting Information [Line Items]    
Total revenues 138.3 126.9
Depreciation & amortization:    
Total depreciation and amortization 4.4 4.7
Kratos Government Solutions | Reportable Segments    
Operating income from continuing operations:    
Total operating income from continuing operations 7.1 9.3
Unmanned Systems    
Segment Reporting Information [Line Items]    
Total revenues 55.9 42.0
Depreciation & amortization:    
Total depreciation and amortization 1.9 1.6
Unmanned Systems | Reportable Segments    
Operating income from continuing operations:    
Total operating income from continuing operations 4.2 0.5
Service revenues    
Segment Reporting Information [Line Items]    
Total revenues 57.3 63.6
Service revenues | Kratos Government Solutions    
Segment Reporting Information [Line Items]    
Total revenues 56.1 63.6
Service revenues | Unmanned Systems    
Segment Reporting Information [Line Items]    
Total revenues 1.2 0.0
Product sales    
Segment Reporting Information [Line Items]    
Total revenues 136.9 105.3
Product sales | Kratos Government Solutions    
Segment Reporting Information [Line Items]    
Total revenues 82.2 63.3
Product sales | Unmanned Systems    
Segment Reporting Information [Line Items]    
Total revenues $ 54.7 $ 42.0