Segment Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 30, 2014 Segment	Mar. 31, 2013
Segment Reporting Information [Line Items]
Number of principal business segments	2
Service revenues	$ 100.6	$ 115.5
Product sales	99.5	137.3
Total revenues	200.1	252.8
Total depreciation and amortization	9.6	14.2
Total operating income	3.3	11.5
Kratos Government Solutions
Segment Reporting Information [Line Items]
Service revenues	51.7	64.9
Product sales	99.5	137.3
Total revenues	151.2	202.2
Total depreciation and amortization	9.1	13.2
Total operating income	4.1	12.2
Public Safety & Security
Segment Reporting Information [Line Items]
Service revenues	48.9	50.6
Product sales	0	0
Total revenues	48.9	50.6
Total depreciation and amortization	0.5	1.0
Total operating income	1.0	1.2
Unallocated corporate expense, net
Segment Reporting Information [Line Items]
Total operating income	$ (1.8)	$ (1.9)