Segment Information - Schedule of Segment Revenues, Depreciation and Amortization, and Operating (Loss) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 27, 2016	Mar. 29, 2015
Revenues:
Service revenues	$ 82.6	$ 87.3
Product sales	70.4	69.8
Total revenues	153.0	157.1
Depreciation & amortization:
Total depreciation and amortization	6.1	6.9
Operating income (loss) from continuing operations:
Total operating loss from continuing operations	(10.2)	(3.9)
Reportable Segments
Depreciation & amortization:
Total depreciation and amortization	6.1	6.9
Unallocated corporate expense, net
Operating income (loss) from continuing operations:
Total operating loss from continuing operations	(1.5)	(2.1)
Kratos Government Solutions | Reportable Segments
Revenues:
Service revenues	52.4	49.8
Product sales	56.2	57.4
Total revenues	108.6	107.2
Depreciation & amortization:
Total depreciation and amortization	4.1	5.1
Operating income (loss) from continuing operations:
Total operating loss from continuing operations	(1.8)	2.4
Public Safety & Security | Reportable Segments
Revenues:
Service revenues	30.2	37.5
Product sales	0.0	0.0
Total revenues	30.2	37.5
Depreciation & amortization:
Total depreciation and amortization	0.1	0.2
Operating income (loss) from continuing operations:
Total operating loss from continuing operations	(2.7)	0.0
Unmanned Systems | Reportable Segments
Revenues:
Service revenues	0.0	0.0
Product sales	14.2	12.4
Total revenues	14.2	12.4
Depreciation & amortization:
Total depreciation and amortization	1.9	1.6
Operating income (loss) from continuing operations:
Total operating loss from continuing operations	$ (4.2)	$ (4.2)