Significant Customers (Details) (U.S. Government, Kratos Government Solutions, USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2013	Mar. 25, 2012
U.S. Government \| Kratos Government Solutions
Revenue, Major Customer [Line Items]
Sales to the U.S. Government - amount	$ 160.7	$ 140.9
Sales to the U.S. Government - percentage of total revenue	64.00%	67.00%

Amount of revenue generated from a single external customer that accounts for 10 percent or more of an entity's revenues.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 280

-SubTopic 10

-Section 50

-Paragraph 42

-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9054-108599

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 131

-Paragraph 39

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration