Significant Customers (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 28, 2014	Sep. 29, 2013	Sep. 28, 2014	Sep. 29, 2013
Revenue, Major Customer [Line Items]
Sales to the U.S. Government - amount	$ 217.1	$ 226.4	$ 646.5	$ 714.9
Kratos Government Solutions
Revenue, Major Customer [Line Items]
Sales to the U.S. Government - amount	174.3	174.6	491.2	560.8
U.S. Government | Kratos Government Solutions
Revenue, Major Customer [Line Items]
Sales to the U.S. Government - amount	$ 139.1	$ 143.4	$ 378.4	$ 460.9
Sales to the U.S. Government - percentage of total revenue	64.00%	63.00%	59.00%	64.00%