Segment Information - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 28, 2025 USD ($) segment	Dec. 29, 2024 USD ($)	Dec. 31, 2023 USD ($)
Segment Reporting Information [Line Items]
Number of reportable (in segments) | segment	2
Total revenues	$ 1,346.8	$ 1,136.3	$ 1,037.1
Kratos Government Solutions
Segment Reporting Information [Line Items]
Total revenues	1,054.8	865.8	824.9
Assets of foreign subsidiaries	300.5	223.2	204.6
Non-US
Segment Reporting Information [Line Items]
Total revenues	$ 267.7	$ 226.6	$ 202.0
Percentage of foreign revenue to total revenue (percent)	20.00%	20.00%	19.00%