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Significant Customers	3 Months Ended
Significant Customers	Mar. 31, 2019
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 $116.9 million and $100.9 million, or 73% and 71% of total Kratos revenue, for the three months ended March 31, 2019 and April 1, 2018, respectively.