CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 27, 2020	Dec. 29, 2019	Dec. 30, 2018
Total revenues	$ 747.7	$ 717.5	$ 618.0
Total costs	544.5	527.5	448.3
Gross profit	203.2	190.0	169.7
Selling, general and administrative expenses	144.5	130.8	119.8
Merger and acquisition related items	1.7	2.3	0.0
Research and development expenses	27.0	18.0	15.6
Restructuring expenses and other	0.7	0.9	3.8
Operating income	29.3	38.0	30.5
Other expense:
Interest expense, net	(22.8)	(21.6)	(20.8)
Other income (expense), net	0.3	(0.7)	(1.0)
Total other expense, net	(22.5)	(22.3)	(21.8)
Income from continuing operations before income taxes	6.8	15.7	8.7
Provision (benefit) for income taxes from continuing operations	(73.5)	4.8	4.6
Income from continuing operations	80.3	10.9	4.1
Income (loss) from operations of discontinued component (including gain on disposal of $0.0 million for the year ended December 30, 2018)	(1.2)	1.9	(9.4)
Income tax expense (benefit)	(0.3)	0.2	(1.8)
Income (loss) from discontinued operations	(0.9)	1.7	(7.6)
Net income (loss)	79.4	12.6	(3.5)
Less: Net income (loss) attributable to noncontrolling interest	(0.2)	0.1	0.0
Net income (loss) attributable to Kratos	$ 79.6	$ 12.5	$ (3.5)
Basic income and (loss) per common share attributable to Kratos:
Income (loss) from continuing operations (in dollars per share)	$ 0.70	$ 0.10	$ 0.04
Income (loss) from discontinued operations (in dollars per share)	(0.01)	0.02	(0.07)
Net income (loss) per common share (in dollars per share)	0.69	0.12	(0.03)
Diluted income (loss) per common share attributable to Kratos:
Income from continuing operations (in dollars per share)	0.68	0.10	0.04
Income (loss) from discontinued operations (in dollars per share)	(0.01)	0.01	(0.07)
Net income (loss) per common share (in dollars per share)	$ 0.67	$ 0.11	$ (0.03)
Weighted average common shares outstanding:
Basic (in shares)	115.5	106.0	103.8
Diluted (in shares)	118.7	109.2	106.1
Service revenues
Total revenues	$ 248.7	$ 272.6	$ 200.7
Total costs	182.5	192.0	137.8
Product sales
Total revenues	499.0	444.9	417.3
Total costs	$ 362.0	$ 335.5	$ 310.5