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Revenue Disaggregation of revenues (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 29, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2016	Oct. 01, 2016	Jul. 02, 2016	Apr. 02, 2016	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Disaggregation of Revenue [Line Items]
Net sales	$ 853,130	$ 812,576	$ 846,646	$ 875,374	$ 952,549	$ 936,262	$ 894,930	$ 878,510	$ 3,387,726	$ 3,662,251	$ 3,391,928
North America
Disaggregation of Revenue [Line Items]
Net sales									1,817,001	1,937,027	1,817,659
Europe
Disaggregation of Revenue [Line Items]
Net sales									1,225,461	1,372,750	1,225,397
China
Disaggregation of Revenue [Line Items]
Net sales									210,657	209,780	218,480
South America
Disaggregation of Revenue [Line Items]
Net sales									53,206	60,111	55,089
Other Geographical Areas [Member]
Disaggregation of Revenue [Line Items]
Net sales									81,401	82,583	75,303
Fats [Member]
Disaggregation of Revenue [Line Items]
Net sales									728,605	832,047	740,720
Used Cooking Oil [Member]
Disaggregation of Revenue [Line Items]
Net sales									166,634	185,516	165,061
Proteins [Member]
Disaggregation of Revenue [Line Items]
Net sales									842,878	816,060	769,391
Bakery [Member]
Disaggregation of Revenue [Line Items]
Net sales									180,227	209,801	220,438
Other Rendering [Member]
Disaggregation of Revenue [Line Items]
Net sales									129,273	286,183	269,196
Food Ingredients, Products and Services [Member]
Disaggregation of Revenue [Line Items]
Net sales									886,042	880,128	826,216
Bioenergy [Member]
Disaggregation of Revenue [Line Items]
Net sales									247,187	218,787	198,157
Biofuels [Member]
Disaggregation of Revenue [Line Items]
Net sales									48,858	46,996	48,901
Other, Products And Services [Member]
Disaggregation of Revenue [Line Items]
Net sales									158,022	186,733	153,848
Food Ingredients [Member]
Disaggregation of Revenue [Line Items]
Net sales									1,139,126	1,156,976	1,055,725
Food Ingredients [Member] | North America
Disaggregation of Revenue [Line Items]
Net sales									181,213	193,950	188,506
Food Ingredients [Member] | Europe
Disaggregation of Revenue [Line Items]
Net sales									648,933	650,177	560,116
Food Ingredients [Member] | China
Disaggregation of Revenue [Line Items]
Net sales									182,369	177,677	182,287
Food Ingredients [Member] | South America
Disaggregation of Revenue [Line Items]
Net sales									53,206	60,111	55,089
Food Ingredients [Member] | Other Geographical Areas [Member]
Disaggregation of Revenue [Line Items]
Net sales									73,405	75,061	69,727
Food Ingredients [Member] | Fats [Member]
Disaggregation of Revenue [Line Items]
Net sales									163,815	183,719	166,167
Food Ingredients [Member] | Used Cooking Oil [Member]
Disaggregation of Revenue [Line Items]
Net sales									0	0	0
Food Ingredients [Member] | Proteins [Member]
Disaggregation of Revenue [Line Items]
Net sales									0	0	0
Food Ingredients [Member] | Bakery [Member]
Disaggregation of Revenue [Line Items]
Net sales									0	0	0
Food Ingredients [Member] | Other Rendering [Member]
Disaggregation of Revenue [Line Items]
Net sales									0	0	0
Food Ingredients [Member] | Food Ingredients, Products and Services [Member]
Disaggregation of Revenue [Line Items]
Net sales									886,042	880,128	826,216
Food Ingredients [Member] | Bioenergy [Member]
Disaggregation of Revenue [Line Items]
Net sales									0	0	0
Food Ingredients [Member] | Biofuels [Member]
Disaggregation of Revenue [Line Items]
Net sales									0	0	0
Food Ingredients [Member] | Other, Products And Services [Member]
Disaggregation of Revenue [Line Items]
Net sales									89,269	93,129	63,342
Fuel Ingredients [Member]
Disaggregation of Revenue [Line Items]
Net sales									296,045	265,783	247,058
Fuel Ingredients [Member] | North America
Disaggregation of Revenue [Line Items]
Net sales									48,858	46,996	48,901
Fuel Ingredients [Member] | Europe
Disaggregation of Revenue [Line Items]
Net sales									247,187	218,787	198,157
Fuel Ingredients [Member] | China
Disaggregation of Revenue [Line Items]
Net sales									0	0	0
Fuel Ingredients [Member] | South America
Disaggregation of Revenue [Line Items]
Net sales									0	0	0
Fuel Ingredients [Member] | Other Geographical Areas [Member]
Disaggregation of Revenue [Line Items]
Net sales									0	0	0
Fuel Ingredients [Member] | Fats [Member]
Disaggregation of Revenue [Line Items]
Net sales									0	0	0
Fuel Ingredients [Member] | Used Cooking Oil [Member]
Disaggregation of Revenue [Line Items]
Net sales									0	0	0
Fuel Ingredients [Member] | Proteins [Member]
Disaggregation of Revenue [Line Items]
Net sales									0	0	0
Fuel Ingredients [Member] | Bakery [Member]
Disaggregation of Revenue [Line Items]
Net sales									0	0	0
Fuel Ingredients [Member] | Other Rendering [Member]
Disaggregation of Revenue [Line Items]
Net sales									0	0	0
Fuel Ingredients [Member] | Food Ingredients, Products and Services [Member]
Disaggregation of Revenue [Line Items]
Net sales									0	0	0
Fuel Ingredients [Member] | Bioenergy [Member]
Disaggregation of Revenue [Line Items]
Net sales									247,187	218,787	198,157
Fuel Ingredients [Member] | Biofuels [Member]
Disaggregation of Revenue [Line Items]
Net sales									48,858	46,996	48,901
Fuel Ingredients [Member] | Other, Products And Services [Member]
Disaggregation of Revenue [Line Items]
Net sales									0	0	0
Feed Ingredients [Member]
Disaggregation of Revenue [Line Items]
Net sales									1,952,555	2,239,492	2,089,145
Feed Ingredients [Member] | North America
Disaggregation of Revenue [Line Items]
Net sales									1,586,930	1,696,081	1,580,252
Feed Ingredients [Member] | Europe
Disaggregation of Revenue [Line Items]
Net sales									329,341	503,786	467,124
Feed Ingredients [Member] | China
Disaggregation of Revenue [Line Items]
Net sales									28,288	32,103	36,193
Feed Ingredients [Member] | South America
Disaggregation of Revenue [Line Items]
Net sales									0	0	0
Feed Ingredients [Member] | Other Geographical Areas [Member]
Disaggregation of Revenue [Line Items]
Net sales									7,996	7,522	5,576
Feed Ingredients [Member] | Fats [Member]
Disaggregation of Revenue [Line Items]
Net sales									564,790	648,328	574,553
Feed Ingredients [Member] | Used Cooking Oil [Member]
Disaggregation of Revenue [Line Items]
Net sales									166,634	185,516	165,061
Feed Ingredients [Member] | Proteins [Member]
Disaggregation of Revenue [Line Items]
Net sales									842,878	816,060	769,391
Feed Ingredients [Member] | Bakery [Member]
Disaggregation of Revenue [Line Items]
Net sales									180,227	209,801	220,438
Feed Ingredients [Member] | Other Rendering [Member]
Disaggregation of Revenue [Line Items]
Net sales									129,273	286,183	269,196
Feed Ingredients [Member] | Food Ingredients, Products and Services [Member]
Disaggregation of Revenue [Line Items]
Net sales									0	0	0
Feed Ingredients [Member] | Bioenergy [Member]
Disaggregation of Revenue [Line Items]
Net sales									0	0	0
Feed Ingredients [Member] | Biofuels [Member]
Disaggregation of Revenue [Line Items]
Net sales									0	0	0
Feed Ingredients [Member] | Other, Products And Services [Member]
Disaggregation of Revenue [Line Items]
Net sales									$ 68,753	93,604	90,506
Calculated under Revenue Guidance in Effect before Topic 606 [Member]
Disaggregation of Revenue [Line Items]
Revenue, Modified Retrospective Basis Effect										$ 160,000	$ 149,000

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