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Derivatives (Narrative) (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jul. 01, 2017 | Jun. 30, 2018 | Jul. 01, 2017 | Dec. 30, 2017
Derivative [Line Items] |  |  |  |  |
Net income/(loss) | $ (29,138,000) | $ 10,328,000 | $ 68,937,000 | $ 17,726,000 |
Commodity Contract [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Forward purchase amount | 14,200,000 |  | 14,200,000 |  |
Cash Flow Hedging [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Cash flow hedge gain (loss) to be reclassified within 12 months |  |  | 700,000 |  |
Net income/(loss) |  |  | 0 |  |
Designated as Hedging Instrument [Member] | Other Current Assets [Member] | Soybean Meal [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Asset Derivatives Fair Value | 700,000 |  | 700,000 |  | $ 0
Designated as Hedging Instrument [Member] | Other Current Assets [Member] | Corn Option [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Asset Derivatives Fair Value | $ 1,400,000 |  | $ 1,400,000 |  | $ 3,400,000

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