Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 26, 2023	Mar. 27, 2022
Disaggregation of Revenue [Line Items]
Total Revenues	$ 231.8	$ 196.2
Kratos Government Solutions
Disaggregation of Revenue [Line Items]
Total Revenues	183.8	143.6
Kratos Government Solutions | U.S. Government
Disaggregation of Revenue [Line Items]
Total Revenues	114.5	89.5
Kratos Government Solutions | International
Disaggregation of Revenue [Line Items]
Total Revenues	45.0	34.7
Kratos Government Solutions | U.S. Commercial and other customers
Disaggregation of Revenue [Line Items]
Total Revenues	24.3	19.4
Unmanned Systems
Disaggregation of Revenue [Line Items]
Total Revenues	48.0	52.6
Unmanned Systems | U.S. Government
Disaggregation of Revenue [Line Items]
Total Revenues	45.8	50.1
Unmanned Systems | International
Disaggregation of Revenue [Line Items]
Total Revenues	1.9	1.8
Unmanned Systems | U.S. Commercial and other customers
Disaggregation of Revenue [Line Items]
Total Revenues	0.3	0.7
Fixed price | Kratos Government Solutions
Disaggregation of Revenue [Line Items]
Total Revenues	127.0	101.3
Fixed price | Unmanned Systems
Disaggregation of Revenue [Line Items]
Total Revenues	36.9	31.5
Cost plus fee | Kratos Government Solutions
Disaggregation of Revenue [Line Items]
Total Revenues	45.7	32.3
Cost plus fee | Unmanned Systems
Disaggregation of Revenue [Line Items]
Total Revenues	8.1	20.4
Time and materials | Kratos Government Solutions
Disaggregation of Revenue [Line Items]
Total Revenues	11.1	10.0
Time and materials | Unmanned Systems
Disaggregation of Revenue [Line Items]
Total Revenues	$ 3.0	$ 0.7