Business Segments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 28, 2024	Sep. 30, 2023	Sep. 28, 2024	Sep. 30, 2023	Dec. 30, 2023
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	$ 1,421,891	$ 1,625,204	$ 4,297,482	$ 5,173,997
Cost of sales and operating expenses (excludes depreciation and amortization, shown separately below)	1,108,319	1,238,733	3,353,406	3,965,408
Gross margin			944,076	1,208,589
Loss/(gain) on sale of assets	251	929	(101)	861
Selling, general and administrative expenses	115,717	137,697	384,591	409,914
Restructuring and asset impairment charges	0	0	0	5,420
Acquisition and integration costs	218	3,430	5,402	12,158
Change in fair value of contingent consideration	16,156	(5,559)	(42,215)	(13,058)
Depreciation and amortization	123,553	125,994	375,667	364,086
Equity in net income of Diamond Green Diesel	2,430	54,389	125,046	361,690
Operating income	60,107	178,369	345,778	790,898
Equity in net income of other unconsolidated subsidiaries	3,782	1,534	9,109	3,503
Segment income/(loss)			354,887	794,401
Total other expense	(62,245)	(67,186)	(185,609)	(168,946)
Income before income taxes	1,644	112,717	169,278	625,455
Segment Assets	10,572,719		10,572,719		$ 11,061,084
Operating Segments
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	1,421,891	1,625,204
Cost of sales and operating expenses (excludes depreciation and amortization, shown separately below)	1,108,319	1,238,733
Gross margin	313,572	386,471
Loss/(gain) on sale of assets	251	929
Selling, general and administrative expenses	115,717	137,697
Acquisition and integration costs	218	3,430
Change in fair value of contingent consideration	16,156	(5,559)
Depreciation and amortization	123,553	125,994
Equity in net income of Diamond Green Diesel	2,430	54,389
Operating income	60,107	178,369
Equity in net income of other unconsolidated subsidiaries	3,782	1,534
Segment income/(loss)	63,889	179,903
Feed Ingredients
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	927,457	1,047,796	2,751,452	3,426,950
Cost of sales and operating expenses (excludes depreciation and amortization, shown separately below)	727,642	804,312	2,171,282	2,630,797
Gross margin	199,815	243,484	580,170	796,153
Loss/(gain) on sale of assets	204	833	541	813
Selling, general and administrative expenses	67,445	80,985	218,598	233,082
Restructuring and asset impairment charges				92
Acquisition and integration costs	0	0	0	0
Change in fair value of contingent consideration	16,156	(5,559)	(42,215)	(13,058)
Depreciation and amortization	85,480	88,954	259,493	261,849
Equity in net income of Diamond Green Diesel	0	0	0	0
Operating income	30,530	78,271	143,753	313,375
Equity in net income of other unconsolidated subsidiaries	3,782	1,534	9,109	3,503
Segment income/(loss)	34,312	79,805	152,862	316,878
Segment Assets	4,318,626		4,318,626		4,702,593
Food Ingredients
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	357,292	455,744	1,127,415	1,328,229
Cost of sales and operating expenses (excludes depreciation and amortization, shown separately below)	271,861	338,208	846,766	999,418
Gross margin	85,431	117,536	280,649	328,811
Loss/(gain) on sale of assets	49	117	(208)	99
Selling, general and administrative expenses	28,351	31,463	88,939	98,269
Restructuring and asset impairment charges				5,328
Acquisition and integration costs	0	0	0	0
Change in fair value of contingent consideration	0	0	0	0
Depreciation and amortization	26,743	25,418	82,983	68,336
Equity in net income of Diamond Green Diesel	0	0	0	0
Operating income	30,288	60,538	108,935	156,779
Equity in net income of other unconsolidated subsidiaries	0	0	0	0
Segment income/(loss)	30,288	60,538	108,935	156,779
Segment Assets	2,219,932		2,219,932		2,646,702
Fuel Ingredients
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	137,142	121,664	418,615	418,818
Cost of sales and operating expenses (excludes depreciation and amortization, shown separately below)	108,816	96,213	335,358	335,193
Gross margin	28,326	25,451	83,257	83,625
Loss/(gain) on sale of assets	(2)	(21)	(434)	(51)
Selling, general and administrative expenses	7,757	5,666	24,911	16,829
Restructuring and asset impairment charges				0
Acquisition and integration costs	0	0	0	0
Change in fair value of contingent consideration	0	0	0	0
Depreciation and amortization	9,297	9,026	26,687	25,986
Equity in net income of Diamond Green Diesel	2,430	54,389	125,046	361,690
Operating income	13,704	65,169	157,139	402,551
Equity in net income of other unconsolidated subsidiaries	0	0	0	0
Segment income/(loss)	13,704	65,169	157,139	402,551
Segment Assets	2,611,464		2,611,464		2,589,145
Corporate
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	0	0	0	0
Cost of sales and operating expenses (excludes depreciation and amortization, shown separately below)	0	0	0	0
Gross margin	0	0	0	0
Loss/(gain) on sale of assets	0	0	0	0
Selling, general and administrative expenses	12,164	19,583	52,143	61,734
Restructuring and asset impairment charges				0
Acquisition and integration costs	218	3,430	5,402	12,158
Change in fair value of contingent consideration	0	0	0	0
Depreciation and amortization	2,033	2,596	6,504	7,915
Equity in net income of Diamond Green Diesel	0	0	0	0
Operating income	(14,415)	(25,609)	(64,049)	(81,807)
Equity in net income of other unconsolidated subsidiaries	0	0	0	0
Segment income/(loss)	(14,415)	$ (25,609)	(64,049)	$ (81,807)
Segment Assets	$ 1,422,697		$ 1,422,697		$ 1,122,644