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Significant Customers	12 Months Ended
Significant Customers	Dec. 29, 2013
Segment Reporting [Abstract]
Significant Customers	Significant Customers Revenue from the U.S. Government (which includes Foreign Military Sales) includes revenue from contracts for which Kratos is the prime contractor as well as those for which the Company is a subcontractor and the ultimate customer is the U.S. Government. The KGS segment has substantial revenue from the U.S. Government. Sales to the U.S. Government amounted to approximately $534.5 million, $627.8 million, and $606.7 million or 75%, 65%, and 64%, of total revenue for the years ended December 25, 2011, December 30, 2012, and December 29, 2013, respectively.