Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 30, 2025	Mar. 31, 2024
Disaggregation of Revenue [Line Items]
Total Revenues	$ 302.6	$ 277.2
Kratos Government Solutions
Disaggregation of Revenue [Line Items]
Total Revenues	239.5	217.8
Kratos Government Solutions | U.S. Government
Disaggregation of Revenue [Line Items]
Total Revenues	149.4	135.1
Kratos Government Solutions | International
Disaggregation of Revenue [Line Items]
Total Revenues	55.3	50.7
Kratos Government Solutions | U.S. Commercial and other customers
Disaggregation of Revenue [Line Items]
Total Revenues	34.8	32.0
Unmanned Systems
Disaggregation of Revenue [Line Items]
Total Revenues	63.1	59.4
Unmanned Systems | U.S. Government
Disaggregation of Revenue [Line Items]
Total Revenues	56.1	55.8
Unmanned Systems | International
Disaggregation of Revenue [Line Items]
Total Revenues	5.8	2.4
Unmanned Systems | U.S. Commercial and other customers
Disaggregation of Revenue [Line Items]
Total Revenues	1.2	1.2
Fixed price | Kratos Government Solutions
Disaggregation of Revenue [Line Items]
Total Revenues	166.5	145.7
Fixed price | Unmanned Systems
Disaggregation of Revenue [Line Items]
Total Revenues	52.6	43.9
Cost plus fee | Kratos Government Solutions
Disaggregation of Revenue [Line Items]
Total Revenues	58.0	58.6
Cost plus fee | Unmanned Systems
Disaggregation of Revenue [Line Items]
Total Revenues	9.8	13.5
Time and materials | Kratos Government Solutions
Disaggregation of Revenue [Line Items]
Total Revenues	15.0	13.5
Time and materials | Unmanned Systems
Disaggregation of Revenue [Line Items]
Total Revenues	$ 0.7	$ 2.0