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Derivatives (Narrative) (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 29, 2018 | Sep. 30, 2017 | Sep. 29, 2018 | Sep. 30, 2017 | Dec. 30, 2017
Derivative [Line Items] |  |  |  |  |
Net income/(loss) | $ (5,137,000) | $ 8,684,000 | $ 63,800,000 | $ 26,410,000 |
Commodity Contract [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Forward purchase amount | 20,900,000 |  | 20,900,000 |  |
Cash Flow Hedging [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Cash flow hedge gain (loss) to be reclassified within 12 months |  |  | 1,100,000 |  |
Net income/(loss) |  |  | 0 |  |
Designated as Hedging Instrument [Member] | Other Current Assets [Member] | Foreign Exchange Contract [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Asset Derivatives Fair Value | 500,000 |  | 500,000 |  | $ 0
Designated as Hedging Instrument [Member] | Other Current Assets [Member] | Soybean Meal [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Asset Derivatives Fair Value | 400,000 |  | 400,000 |  | 0
Designated as Hedging Instrument [Member] | Other Current Assets [Member] | Corn Option [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Asset Derivatives Fair Value | $ 700,000 |  | $ 700,000 |  | $ 3,400,000

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