Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 26, 2023
Disaggregation of Revenue [Line Items]
Total Revenues	$ 277.2	$ 231.8
Kratos Government Solutions
Disaggregation of Revenue [Line Items]
Total Revenues	217.8	183.8
Kratos Government Solutions | U.S. Government
Disaggregation of Revenue [Line Items]
Total Revenues	135.1	114.5
Kratos Government Solutions | International
Disaggregation of Revenue [Line Items]
Total Revenues	50.7	45.0
Kratos Government Solutions | U.S. Commercial and other customers
Disaggregation of Revenue [Line Items]
Total Revenues	32.0	24.3
Unmanned Systems
Disaggregation of Revenue [Line Items]
Total Revenues	59.4	48.0
Unmanned Systems | U.S. Government
Disaggregation of Revenue [Line Items]
Total Revenues	55.8	45.8
Unmanned Systems | International
Disaggregation of Revenue [Line Items]
Total Revenues	2.4	1.9
Unmanned Systems | U.S. Commercial and other customers
Disaggregation of Revenue [Line Items]
Total Revenues	1.2	0.3
Fixed price | Kratos Government Solutions
Disaggregation of Revenue [Line Items]
Total Revenues	145.7	127.0
Fixed price | Unmanned Systems
Disaggregation of Revenue [Line Items]
Total Revenues	43.9	36.9
Cost plus fee | Kratos Government Solutions
Disaggregation of Revenue [Line Items]
Total Revenues	58.6	45.7
Cost plus fee | Unmanned Systems
Disaggregation of Revenue [Line Items]
Total Revenues	13.5	8.1
Time and materials | Kratos Government Solutions
Disaggregation of Revenue [Line Items]
Total Revenues	13.5	11.1
Time and materials | Unmanned Systems
Disaggregation of Revenue [Line Items]
Total Revenues	$ 2.0	$ 3.0