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Significant Customers	12 Months Ended
Significant Customers	Dec. 31, 2017
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 and US segments have substantial revenue from the U.S. Government. Sales to the U.S. Government amounted to approximately $452.8 million, $398.3 million, and $402.9 million or 60%, 60%, and 61%, of total revenue for the years ended December 31, 2017, December 25, 2016, and December 27, 2015, respectively.