CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 25, 2022	Sep. 26, 2021	Sep. 25, 2022	Sep. 26, 2021
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (8.0)	$ (1.9)	$ (28.3)	$ 0.9
Change in cumulative translation adjustment	(3.7)	(0.9)	(4.3)	(0.1)
Comprehensive income (loss)	(11.7)	(2.8)	(32.6)	0.8
Less: Comprehensive income attributable to noncontrolling interest	0.0	0.5	0.3	0.3
Comprehensive income (loss) attributable to Kratos	$ (11.7)	$ (3.3)	$ (32.9)	$ 0.5