Revenue Disaggregation of revenues (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Jan. 01, 2022	Jan. 02, 2021
Disaggregation of Revenue [Line Items]
Net sales	$ 6,532,204	$ 4,741,369	$ 3,571,923
North America
Disaggregation of Revenue [Line Items]
Net sales	4,222,058	2,867,934	1,960,503
Europe
Disaggregation of Revenue [Line Items]
Net sales	1,769,973	1,521,031	1,296,668
China
Disaggregation of Revenue [Line Items]
Net sales	284,684	253,212	202,093
South America
Disaggregation of Revenue [Line Items]
Net sales	187,343	31,446	38,238
Other Geographical Areas [Member]
Disaggregation of Revenue [Line Items]
Net sales	68,146	67,746	74,421
Fats [Member]
Disaggregation of Revenue [Line Items]
Net sales	2,156,857	1,380,796	804,737
Used Cooking Oil [Member]
Disaggregation of Revenue [Line Items]
Net sales	519,119	319,145	176,691
Proteins [Member]
Disaggregation of Revenue [Line Items]
Net sales	1,476,553	1,022,694	830,195
Bakery [Member]
Disaggregation of Revenue [Line Items]
Net sales	333,442	287,424	183,759
Other Rendering [Member]
Disaggregation of Revenue [Line Items]
Net sales	200,945	173,405	178,601
Food Ingredients, Products and Services [Member]
Disaggregation of Revenue [Line Items]
Net sales	1,121,995	961,617	947,928
Bioenergy [Member]
Disaggregation of Revenue [Line Items]
Net sales	533,574	426,863	293,249
Biofuels [Member]
Disaggregation of Revenue [Line Items]
Net sales		3,377	20,869
Other, Products And Services [Member]
Disaggregation of Revenue [Line Items]
Net sales	189,719	166,048	135,894
Food Ingredients [Member]
Disaggregation of Revenue [Line Items]
Net sales	1,459,630	1,271,629	1,185,701
Food Ingredients [Member] | North America
Disaggregation of Revenue [Line Items]
Net sales	369,499	286,852	244,929
Food Ingredients [Member] | Europe
Disaggregation of Revenue [Line Items]
Net sales	733,967	663,619	650,671
Food Ingredients [Member] | China
Disaggregation of Revenue [Line Items]
Net sales	259,584	233,766	188,417
Food Ingredients [Member] | South America
Disaggregation of Revenue [Line Items]
Net sales	40,661	31,446	38,238
Food Ingredients [Member] | Other Geographical Areas [Member]
Disaggregation of Revenue [Line Items]
Net sales	55,919	55,946	63,446
Food Ingredients [Member] | Fats [Member]
Disaggregation of Revenue [Line Items]
Net sales	205,674	182,674	142,963
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	1,121,995	961,617	947,928
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
Food Ingredients [Member] | Other, Products And Services [Member]
Disaggregation of Revenue [Line Items]
Net sales	131,961	127,338	94,810
Fuel Ingredients [Member]
Disaggregation of Revenue [Line Items]
Net sales	533,574	430,240	314,118
Fuel Ingredients [Member] | North America
Disaggregation of Revenue [Line Items]
Net sales	0	3,377	20,869
Fuel Ingredients [Member] | Europe
Disaggregation of Revenue [Line Items]
Net sales	533,574	426,863	293,249
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	533,574	426,863	293,249
Fuel Ingredients [Member] | Biofuels [Member]
Disaggregation of Revenue [Line Items]
Net sales		3,377	20,869
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	4,539,000	3,039,500	2,072,104
Feed Ingredients [Member] | North America
Disaggregation of Revenue [Line Items]
Net sales	3,852,559	2,577,705	1,694,705
Feed Ingredients [Member] | Europe
Disaggregation of Revenue [Line Items]
Net sales	502,432	430,549	352,748
Feed Ingredients [Member] | China
Disaggregation of Revenue [Line Items]
Net sales	25,100	19,446	13,676
Feed Ingredients [Member] | South America
Disaggregation of Revenue [Line Items]
Net sales	146,682	0	0
Feed Ingredients [Member] | Other Geographical Areas [Member]
Disaggregation of Revenue [Line Items]
Net sales	12,227	11,800	10,975
Feed Ingredients [Member] | Fats [Member]
Disaggregation of Revenue [Line Items]
Net sales	1,951,183	1,198,122	661,774
Feed Ingredients [Member] | Used Cooking Oil [Member]
Disaggregation of Revenue [Line Items]
Net sales	519,119	319,145	176,691
Feed Ingredients [Member] | Proteins [Member]
Disaggregation of Revenue [Line Items]
Net sales	1,476,553	1,022,694	830,195
Feed Ingredients [Member] | Bakery [Member]
Disaggregation of Revenue [Line Items]
Net sales	333,442	287,424	183,759
Feed Ingredients [Member] | Other Rendering [Member]
Disaggregation of Revenue [Line Items]
Net sales	200,945	173,405	178,601
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
Feed Ingredients [Member] | Other, Products And Services [Member]
Disaggregation of Revenue [Line Items]
Net sales	$ 57,758	$ 38,710	$ 41,084