Segment Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 29, 2014	Jun. 30, 2013	Jun. 29, 2014 Segment	Jun. 30, 2013
Segment Reporting Information [Line Items]
Number of principal business segments			2
Service revenues	$ 101.8	$ 110.2	$ 202.4	$ 226.2
Product sales	127.5	125.0	227.0	262.3
Total revenues	229.3	235.2	429.4	488.5
Total depreciation and amortization	9.7	13.6	19.3	27.8
Total operating income	4.7	8.9	8.0	20.3
Unallocated corporate expense, net
Segment Reporting Information [Line Items]
Total operating income	(3.6)	0.9	(5.4)	(1.0)
Kratos Government Solutions
Segment Reporting Information [Line Items]
Service revenues	51.2	58.5	102.9	123.9
Product sales	114.5	125.0	214.0	262.3
Total revenues	165.7	183.5	316.9	386.2
Total depreciation and amortization	9.2	12.7	18.3	25.9
Total operating income	5.3	5.3	9.4	17.4
Public Safety & Security
Segment Reporting Information [Line Items]
Service revenues	50.6	51.7	99.5	102.3
Product sales	13.0	0	13.0	0
Total revenues	63.6	51.7	112.5	102.3
Total depreciation and amortization	0.5	0.9	1.0	1.9
Total operating income	$ 3.0	$ 2.7	$ 4.0	$ 3.9