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Goodwill (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Dec. 30, 2017
Segment Reporting Information [Line Items] |  |
Goodwill | $ 1,325,522 | $ 1,317,007
Accumulated impairment losses | (15,914) | (15,914)
Goodwill | 1,309,608 | 1,301,093
Goodwill acquired during year | 0 |
Foreign currency translation | 8,515 |
Feed Ingredients |  |
Segment Reporting Information [Line Items] |  |
Goodwill | 848,368 | 848,167
Accumulated impairment losses | (15,914) | (15,914)
Goodwill | 832,454 | 832,253
Goodwill acquired during year | 0 |
Foreign currency translation | 201 |
Fuel Ingredients |  |
Segment Reporting Information [Line Items] |  |
Goodwill | 126,123 | 124,369
Accumulated impairment losses | 0 | 0
Goodwill | 126,123 | 124,369
Goodwill acquired during year | 0 |
Foreign currency translation | 1,754 |
Food Ingredients |  |
Segment Reporting Information [Line Items] |  |
Goodwill | 351,031 | 344,471
Accumulated impairment losses | 0 | 0
Goodwill | 351,031 | $ 344,471
Goodwill acquired during year | 0 |
Foreign currency translation | $ 6,560 |

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