Significant Customers (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 29, 2013	Dec. 30, 2012	Dec. 25, 2011
Revenue, Major Customer [Line Items]
Sales to the U.S. Government - amount	$ 100.9	$ 116.2	$ 54.3
U.S. Government | Kratos Government Solutions
Revenue, Major Customer [Line Items]
Sales to the U.S. Government - amount	$ 606.7	$ 627.8	$ 534.5
Sales to the U.S. Government - percentage of total revenue	64.00%	65.00%	75.00%