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Revenue Disaggregation of revenues (Details) - USD ($) $ in Thousands | 12 Months Ended
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Jan. 01, 2022 | Jan. 02, 2021 | Dec. 28, 2019
Disaggregation of Revenue [Line Items] |  |  |
Net sales | $ 4,741,369 | $ 3,571,923 | $ 3,363,905
North America |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 2,867,934 | 1,960,503 | 1,889,573
Europe |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 1,521,031 | 1,296,668 | 1,153,787
China |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 253,212 | 202,093 | 194,625
South America |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 31,446 | 38,238 | 51,168
Other Geographical Areas [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 67,746 | 74,421 | 74,752
Fats [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 1,380,796 | 804,737 | 718,234
Used Cooking Oil [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 319,145 | 176,691 | 185,705
Proteins [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 1,022,694 | 830,195 | 791,284
Bakery [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 287,424 | 183,759 | 191,551
Other Rendering [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 173,405 | 178,601 | 167,870
Food Ingredients, Products and Services [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 961,617 | 947,928 | 894,761
Bioenergy [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 426,863 | 293,249 | 234,691
Biofuels [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 3,377 | 20,869 | 39,568
Other, Products And Services [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 166,048 | 135,894 | 140,241
Food Ingredients [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 1,271,629 | 1,185,701 | 1,119,085
Food Ingredients [Member] | North America |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 286,852 | 244,929 | 214,623
Food Ingredients [Member] | Europe |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 663,619 | 650,671 | 609,999
Food Ingredients [Member] | China |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 233,766 | 188,417 | 178,283
Food Ingredients [Member] | South America |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 31,446 | 38,238 | 51,168
Food Ingredients [Member] | Other Geographical Areas [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 55,946 | 63,446 | 65,012
Food Ingredients [Member] | Fats [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 182,674 | 142,963 | 133,898
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 | 961,617 | 947,928 | 894,761
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 | 127,338 | 94,810 | 90,426
Fuel Ingredients [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 430,240 | 314,118 | 274,259
Fuel Ingredients [Member] | North America |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 3,377 | 20,869 | 39,568
Fuel Ingredients [Member] | Europe |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 426,863 | 293,249 | 234,691
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 | 426,863 | 293,249 | 234,691
Fuel Ingredients [Member] | Biofuels [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 3,377 | 20,869 | 39,568
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 | 3,039,500 | 2,072,104 | 1,970,561
Feed Ingredients [Member] | North America |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 2,577,705 | 1,694,705 | 1,635,382
Feed Ingredients [Member] | Europe |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 430,549 | 352,748 | 309,097
Feed Ingredients [Member] | China |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 19,446 | 13,676 | 16,342
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 | 11,800 | 10,975 | 9,740
Feed Ingredients [Member] | Fats [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 1,198,122 | 661,774 | 584,336
Feed Ingredients [Member] | Used Cooking Oil [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 319,145 | 176,691 | 185,705
Feed Ingredients [Member] | Proteins [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 1,022,694 | 830,195 | 791,284
Feed Ingredients [Member] | Bakery [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 287,424 | 183,759 | 191,551
Feed Ingredients [Member] | Other Rendering [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net sales | 173,405 | 178,601 | 167,870
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 | $ 38,710 | $ 41,084 | $ 49,815

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