Segment Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013 Segment	Mar. 25, 2012
Segment Reporting Information [Line Items]
Number of principal business segments	2
Revenues	$ 252.8	$ 209.5
Service revenues	115.5	102.1
Product sales	137.3	107.4
Depreciation and amortization	14.2	13.6
Operating income	11.5	9.1
Kratos Government Solutions
Segment Reporting Information [Line Items]
Revenues	202.2	168.9
Service revenues	64.9	61.5
Product sales	137.3	107.4
Depreciation and amortization	13.2	12.8
Operating income	12.2	9.6
Public Safety and Security
Segment Reporting Information [Line Items]
Revenues	50.6	40.6
Service revenues	50.6	40.6
Product sales	0	0
Depreciation and amortization	1.0	0.8
Operating income	1.2	1.2
Unallocated corporate expense, net
Segment Reporting Information [Line Items]
Operating income	$ (1.9)	$ (1.7)