CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 27, 2021	Jun. 28, 2020	Jun. 27, 2021	Jun. 28, 2020
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 0.9	$ (0.8)	$ 2.8	$ (1.0)
Change in cumulative translation adjustment	0.6	(0.3)	0.8	(0.1)
Comprehensive income (loss)	1.5	(1.1)	3.6	(1.1)
Less: Comprehensive loss attributable to noncontrolling interest	(0.2)	(0.1)	(0.2)	(0.1)
Comprehensive income (loss) attributable to Kratos	$ 1.7	$ (1.0)	$ 3.8	$ (1.0)