Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 28, 2019	Dec. 29, 2018
Goodwill [Roll Forward]
Goodwill at beginning of year	$ 1,245,534	$ 1,317,007
Accumulated impairment losses	(16,375)	(15,914)
Goodwill at beginning of year	1,229,159	1,301,093
Goodwill acquired during year	487	29,253
Goodwill disposed of during year	(636)	(61,459)
Goodwill, Impairment Loss		(461)
Foreign currency translation	(5,719)	(39,267)
Goodwill at end of year	1,239,666	1,245,534
Accumulated impairment losses at end of year	(16,375)	(16,375)
Goodwill at end of year	1,223,291	1,229,159
Feed Ingredients [Member]
Goodwill [Roll Forward]
Goodwill at beginning of year	791,966	848,167
Accumulated impairment losses	(15,914)	(15,914)
Goodwill at beginning of year	776,052	832,253
Goodwill acquired during year	396	27,645
Goodwill disposed of during year	(636)	(61,088)
Goodwill, Impairment Loss		0
Foreign currency translation	1,731	(22,758)
Goodwill at end of year	793,457	791,966
Accumulated impairment losses at end of year	(15,914)	(15,914)
Goodwill at end of year	777,543	776,052
Food Ingredients [Member]
Goodwill [Roll Forward]
Goodwill at beginning of year	335,701	344,471
Accumulated impairment losses	(461)	0
Goodwill at beginning of year	335,240	344,471
Goodwill acquired during year	91	1,608
Goodwill disposed of during year	0	(371)
Goodwill, Impairment Loss		(461)
Foreign currency translation	(6,138)	(10,007)
Goodwill at end of year	329,654	335,701
Accumulated impairment losses at end of year	(461)	(461)
Goodwill at end of year	329,193	335,240
Fuel Ingredients [Member]
Goodwill [Roll Forward]
Goodwill at beginning of year	117,867	124,369
Accumulated impairment losses	0	0
Goodwill at beginning of year	117,867	124,369
Goodwill acquired during year	0	0
Goodwill disposed of during year	0	0
Goodwill, Impairment Loss		0
Foreign currency translation	(1,312)	(6,502)
Goodwill at end of year	116,555	117,867
Accumulated impairment losses at end of year	0	0
Goodwill at end of year	$ 116,555	$ 117,867