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Significant Customers	12 Months Ended
Significant Customers	Dec. 25, 2016
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 and US segments have substantial revenue from the U.S. Government. Sales to the U.S. Government amounted to approximately $398.3 million, $402.9 million, and $437.4 million or 60%, 61%, and 57%, of total revenue for the years ended December 25, 2016, December 27, 2015, and December 28, 2014, respectively.