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Financial Instruments - Effects of Derivative Instruments on Statements of Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 27, 2020 | Jun. 29, 2019 | Jun. 27, 2020 | Jun. 29, 2019
Commodity Contracts [Member] | Cost of Goods Sold [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gain (loss) on commodity contracts (nonqualifying) | $ 5,037 | $ 450 | $ (4,439) | $ 1,892

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