Organization and Summary of Significant Accounting Policies - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 28, 2025	Dec. 29, 2024	Dec. 31, 2023
Disaggregation of Revenue [Line Items]
Total revenues	$ 1,346.8	$ 1,136.3	$ 1,037.1
U.S. Government | Revenue Benchmark | Government Contracts Concentration Risk
Disaggregation of Revenue [Line Items]
Sales to the U.S. Government, percentage of total revenue (percent)	68.00%	67.00%	69.00%
Kratos Government Solutions
Disaggregation of Revenue [Line Items]
Total revenues	$ 1,054.8	$ 865.8	$ 824.9
Kratos Government Solutions | U.S. Government
Disaggregation of Revenue [Line Items]
Total revenues	672.3	528.0	512.5
Kratos Government Solutions | International
Disaggregation of Revenue [Line Items]
Total revenues	228.3	195.4	192.8
Kratos Government Solutions | U.S. Commercial and other customers
Disaggregation of Revenue [Line Items]
Total revenues	154.2	142.4	119.6
Kratos Government Solutions | Fixed price
Disaggregation of Revenue [Line Items]
Total revenues	703.1	571.5	566.3
Kratos Government Solutions | Cost plus fee
Disaggregation of Revenue [Line Items]
Total revenues	298.9	233.9	209.5
Kratos Government Solutions | Time and materials
Disaggregation of Revenue [Line Items]
Total revenues	52.8	60.4	49.1
Unmanned Systems
Disaggregation of Revenue [Line Items]
Total revenues	292.0	270.5	212.2
Unmanned Systems | U.S. Government
Disaggregation of Revenue [Line Items]
Total revenues	244.8	234.0	200.2
Unmanned Systems | International
Disaggregation of Revenue [Line Items]
Total revenues	39.3	31.3	9.2
Unmanned Systems | U.S. Commercial and other customers
Disaggregation of Revenue [Line Items]
Total revenues	7.9	5.2	2.8
Unmanned Systems | Fixed price
Disaggregation of Revenue [Line Items]
Total revenues	231.2	216.4	160.9
Unmanned Systems | Cost plus fee
Disaggregation of Revenue [Line Items]
Total revenues	58.1	48.1	41.9
Unmanned Systems | Time and materials
Disaggregation of Revenue [Line Items]
Total revenues	$ 2.7	$ 6.0	$ 9.4