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Significant Customers (Details) - Government contracts - Revenue - U.S. Government - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jul. 01, 2018 | Jun. 25, 2017 | Jul. 01, 2018 | Jun. 25, 2017
Revenue, Major Customer [Line Items] |  |  |  |
Sales to the U.S. Government, amount | $ 106.6 | $ 111.3 | $ 207.5 | $ 207.6
Sales to the U.S. Government, percentage of total revenue (percent) | 70.00% | 75.00% | 71.00% | 74.00%

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