Goodwill (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 02, 2016	Jan. 02, 2016
Segment Reporting Information [Line Items]
Goodwill	$ 1,285,210	$ 1,249,016
Accumulated impairment losses	(15,914)	(15,914)
Goodwill	1,269,296	1,233,102
Goodwill acquired during year	829
Foreign currency translation	35,365
Feed Ingredients [Member]
Segment Reporting Information [Line Items]
Goodwill	832,918	812,797
Accumulated impairment losses	(15,914)	(15,914)
Goodwill	817,004	796,883
Goodwill acquired during year	827
Foreign currency translation	19,294
Fuel Ingredients [Member]
Segment Reporting Information [Line Items]
Goodwill	118,758	112,834
Accumulated impairment losses	0	0
Goodwill	118,758	112,834
Goodwill acquired during year	2
Foreign currency translation	5,922
Food Ingredients [Member]
Segment Reporting Information [Line Items]
Goodwill	333,534	323,385
Accumulated impairment losses	0	0
Goodwill	333,534	$ 323,385
Goodwill acquired during year	0
Foreign currency translation	$ 10,149