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Significant Customers	3 Months Ended
Significant Customers	Apr. 01, 2018
Risks and Uncertainties [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 and US segments have substantial revenue from the U.S. Government. Sales to the U.S. Government amounted to approximately $100.9 million and $96.3 million, or 71% and 73% of total Kratos revenue, for the three months ended April 1, 2018 and March 26, 2017, respectively.