Revenue Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 27, 2025	Sep. 28, 2024	Sep. 27, 2025	Sep. 28, 2024
Disaggregation of Revenue [Line Items]
Net sales	$ 1,563,966	$ 1,421,891	$ 4,426,078	$ 4,297,482
Feed Ingredients
Disaggregation of Revenue [Line Items]
Net sales	1,029,115	927,457	2,861,930	2,751,452
Food Ingredients
Disaggregation of Revenue [Line Items]
Net sales	380,574	357,292	1,115,956	1,127,415
Fuel Ingredients
Disaggregation of Revenue [Line Items]
Net sales	154,277	137,142	448,192	418,615
North America
Disaggregation of Revenue [Line Items]
Net sales	881,789	818,039	2,488,325	2,437,292
North America | Feed Ingredients
Disaggregation of Revenue [Line Items]
Net sales	781,733	720,381	2,179,259	2,132,009
North America | Food Ingredients
Disaggregation of Revenue [Line Items]
Net sales	100,056	97,658	309,066	305,283
North America | Fuel Ingredients
Disaggregation of Revenue [Line Items]
Net sales	0	0	0	0
Europe
Disaggregation of Revenue [Line Items]
Net sales	448,403	394,397	1,303,853	1,219,996
Europe | Feed Ingredients
Disaggregation of Revenue [Line Items]
Net sales	114,784	95,625	323,522	304,195
Europe | Food Ingredients
Disaggregation of Revenue [Line Items]
Net sales	179,342	161,630	532,139	497,186
Europe | Fuel Ingredients
Disaggregation of Revenue [Line Items]
Net sales	154,277	137,142	448,192	418,615
China
Disaggregation of Revenue [Line Items]
Net sales	68,925	62,416	184,104	198,648
China | Feed Ingredients
Disaggregation of Revenue [Line Items]
Net sales	12,017	8,910	23,001	21,747
China | Food Ingredients
Disaggregation of Revenue [Line Items]
Net sales	56,908	53,506	161,103	176,901
China | Fuel Ingredients
Disaggregation of Revenue [Line Items]
Net sales	0	0	0	0
South America
Disaggregation of Revenue [Line Items]
Net sales	147,238	131,169	403,348	392,369
South America | Feed Ingredients
Disaggregation of Revenue [Line Items]
Net sales	116,737	98,980	325,110	282,733
South America | Food Ingredients
Disaggregation of Revenue [Line Items]
Net sales	30,501	32,189	78,238	109,636
South America | Fuel Ingredients
Disaggregation of Revenue [Line Items]
Net sales	0	0	0	0
Other
Disaggregation of Revenue [Line Items]
Net sales	17,611	15,870	46,448	49,177
Other | Feed Ingredients
Disaggregation of Revenue [Line Items]
Net sales	3,844	3,561	11,038	10,768
Other | Food Ingredients
Disaggregation of Revenue [Line Items]
Net sales	13,767	12,309	35,410	38,409
Other | Fuel Ingredients
Disaggregation of Revenue [Line Items]
Net sales	0	0	0	0
Fats
Disaggregation of Revenue [Line Items]
Net sales	472,746	387,852	1,293,311	1,090,138
Fats | Feed Ingredients
Disaggregation of Revenue [Line Items]
Net sales	428,415	346,870	1,159,930	972,792
Fats | Food Ingredients
Disaggregation of Revenue [Line Items]
Net sales	44,331	40,982	133,381	117,346
Fats | Fuel Ingredients
Disaggregation of Revenue [Line Items]
Net sales	0	0	0	0
Used cooking oil
Disaggregation of Revenue [Line Items]
Net sales	125,900	81,674	290,100	253,600
Used cooking oil | Feed Ingredients
Disaggregation of Revenue [Line Items]
Net sales	125,900	81,674	290,100	253,600
Used cooking oil | Food Ingredients
Disaggregation of Revenue [Line Items]
Net sales	0	0	0	0
Used cooking oil | Fuel Ingredients
Disaggregation of Revenue [Line Items]
Net sales	0	0	0	0
Proteins
Disaggregation of Revenue [Line Items]
Net sales	338,800	369,544	1,017,000	1,119,700
Proteins | Feed Ingredients
Disaggregation of Revenue [Line Items]
Net sales	338,800	369,544	1,017,000	1,119,700
Proteins | Food Ingredients
Disaggregation of Revenue [Line Items]
Net sales	0	0	0	0
Proteins | Fuel Ingredients
Disaggregation of Revenue [Line Items]
Net sales	0	0	0	0
Bakery
Disaggregation of Revenue [Line Items]
Net sales	46,900	47,696	149,100	141,100
Bakery | Feed Ingredients
Disaggregation of Revenue [Line Items]
Net sales	46,900	47,696	149,100	141,100
Bakery | Food Ingredients
Disaggregation of Revenue [Line Items]
Net sales	0	0	0	0
Bakery | Fuel Ingredients
Disaggregation of Revenue [Line Items]
Net sales	0	0	0	0
Other rendering
Disaggregation of Revenue [Line Items]
Net sales	76,900	69,658	209,900	225,900
Other rendering | Feed Ingredients
Disaggregation of Revenue [Line Items]
Net sales	76,900	69,658	209,900	225,900
Other rendering | Food Ingredients
Disaggregation of Revenue [Line Items]
Net sales	0	0	0	0
Other rendering | Fuel Ingredients
Disaggregation of Revenue [Line Items]
Net sales	0	0	0	0
Food ingredients
Disaggregation of Revenue [Line Items]
Net sales	311,067	289,311	900,997	935,659
Food ingredients | Feed Ingredients
Disaggregation of Revenue [Line Items]
Net sales	0	0	0	0
Food ingredients | Food Ingredients
Disaggregation of Revenue [Line Items]
Net sales	311,067	289,311	900,997	935,659
Food ingredients | Fuel Ingredients
Disaggregation of Revenue [Line Items]
Net sales	0	0	0	0
Bioenergy
Disaggregation of Revenue [Line Items]
Net sales	154,277	137,142	448,192	418,615
Bioenergy | Feed Ingredients
Disaggregation of Revenue [Line Items]
Net sales	0	0	0	0
Bioenergy | Food Ingredients
Disaggregation of Revenue [Line Items]
Net sales	0	0	0	0
Bioenergy | Fuel Ingredients
Disaggregation of Revenue [Line Items]
Net sales	154,277	137,142	448,192	418,615
Other
Disaggregation of Revenue [Line Items]
Net sales	37,376	39,014	117,478	112,770
Other | Feed Ingredients
Disaggregation of Revenue [Line Items]
Net sales	12,200	12,015	35,900	38,360
Other | Food Ingredients
Disaggregation of Revenue [Line Items]
Net sales	25,176	26,999	81,578	74,410
Other | Fuel Ingredients
Disaggregation of Revenue [Line Items]
Net sales	$ 0	$ 0	$ 0	$ 0