Goodwill and Intangible Assets - Goodwill (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended		6 Months Ended		3 Months Ended	6 Months Ended	1 Months Ended	3 Months Ended
	Jun. 30, 2013	Dec. 30, 2012	Jun. 30, 2013 Public Safety and Security	Dec. 30, 2012 Public Safety and Security	Dec. 30, 2012 Kratos Government Solutions	Jun. 30, 2013 Kratos Government Solutions	Jun. 30, 2012 Discontinued operations	Jun. 24, 2012 Discontinued operations	Dec. 30, 2012 Scenario, Previously Reported [Member]	Dec. 30, 2012 Scenario, Previously Reported [Member] Public Safety and Security	Dec. 30, 2012 Scenario, Previously Reported [Member] Kratos Government Solutions
Goodwill [Line Items]
Goodwill impairment charge associated with discontinued operations					$ 82.0		$ 1.5	$ 1.5
Percentage that goodwill fair value exceeded its carrying value						7.40%
Goodwill	596.4	596.4		35.6	560.8				596.5	35.6	560.9
Restrospective adjustments	(0.1)		0			(0.1)
Accumulated impairment losses	$ 247.4	$ 247.4	$ 18.3	$ 18.3	$ 229.1	$ 229.1