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Significant Customers	9 Months Ended
Significant Customers	Sep. 28, 2014
Segment Reporting [Abstract]
Significant Customers	Significant Customers Revenue from the U.S. Government, which includes foreign military sales, includes revenue from contracts for which the Company 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 $143.4 million and $139.1 million, or 63% and 64% of total Kratos revenue, for the three months ended September 29, 2013 and September 28, 2014, respectively, and approximately $460.9 million and $378.4 million, or 64% and 59% of total revenue, for the nine months ended September 29, 2013 and September 28, 2014, respectively.