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Significant Customers (Details) - U.S. Government - USD ($) $ in Millions	3 Months Ended
	Mar. 29, 2020	Mar. 31, 2019
Revenue, Major Customer [Line Items]
Sales to the U.S. Government, amount	$ 124.1	$ 116.9
Government contracts | Revenue
Revenue, Major Customer [Line Items]
Sales to the U.S. Government, percentage of total revenue (percent)	73.00%	73.00%

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