CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions	3 Months Ended
	Mar. 27, 2022	Mar. 28, 2021
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (15.9)	$ 1.9
Change in cumulative translation adjustment	0.0	0.2
Comprehensive income (loss)	(15.9)	2.1
Less: Comprehensive income attributable to noncontrolling interest	0.0	0.0
Comprehensive income (loss) attributable to Kratos	$ (15.9)	$ 2.1