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

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975

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Amount of accumulated impairment loss for an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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