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Significant Customers	9 Months Ended
Significant Customers	Oct. 01, 2017
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 $118.2 million and $95.4 million, or 60% and 58% of total revenue, for the three months ended October 1, 2017 and September 25, 2016, respectively, and $325.9 million and $293.6 million, or 59% and 60% of total revenue, for the nine months ended October 1, 2017 and September 25, 2016, respectively.