Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 29, 2026	Mar. 30, 2025
Disaggregation of Revenue [Line Items]
Total Revenues	$ 371.0	$ 302.6
Kratos Government Solutions
Disaggregation of Revenue [Line Items]
Total Revenues	288.4	239.5
Kratos Government Solutions | U.S. Government
Disaggregation of Revenue [Line Items]
Total Revenues	179.9	149.4
Kratos Government Solutions | International
Disaggregation of Revenue [Line Items]
Total Revenues	70.6	55.3
Kratos Government Solutions | U.S. Commercial and other customers
Disaggregation of Revenue [Line Items]
Total Revenues	37.9	34.8
Unmanned Systems
Disaggregation of Revenue [Line Items]
Total Revenues	82.6	63.1
Unmanned Systems | U.S. Government
Disaggregation of Revenue [Line Items]
Total Revenues	74.8	56.1
Unmanned Systems | International
Disaggregation of Revenue [Line Items]
Total Revenues	5.8	5.8
Unmanned Systems | U.S. Commercial and other customers
Disaggregation of Revenue [Line Items]
Total Revenues	2.0	1.2
Fixed price | Kratos Government Solutions
Disaggregation of Revenue [Line Items]
Total Revenues	214.2	166.5
Fixed price | Unmanned Systems
Disaggregation of Revenue [Line Items]
Total Revenues	55.9	52.6
Cost plus fee | Kratos Government Solutions
Disaggregation of Revenue [Line Items]
Total Revenues	59.1	58.0
Cost plus fee | Unmanned Systems
Disaggregation of Revenue [Line Items]
Total Revenues	25.0	9.8
Time and materials | Kratos Government Solutions
Disaggregation of Revenue [Line Items]
Total Revenues	15.1	15.0
Time and materials | Unmanned Systems
Disaggregation of Revenue [Line Items]
Total Revenues	$ 1.7	$ 0.7