Other Comprehensive Income (Reclassification out of AOCI) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 27, 2025	Sep. 28, 2024	Sep. 27, 2025	Sep. 28, 2024
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Net sales	$ 1,563,966	$ 1,421,891	$ 4,426,078	$ 4,297,482
Cost of sales and operating expenses (excludes depreciation and amortization, shown separately below)	1,176,957	1,108,319	3,381,801	3,353,406
Income taxes	1,248	17,471	(1,663)	12,790
Amortization of prior service cost	(3)	(6)	(7)	(18)
Amortization of actuarial loss	122	349	578	1,047
Other Comprehensive (Income) Loss, Amortization Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, Settlements, before Tax	(13)	0	(5,867)	0
Net income attributable to Darling	19,363	16,949	5,864	176,972
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Net income attributable to Darling	592	(14,101)	(11,491)	10,563
Reclassification out of Accumulated Other Comprehensive Income [Member] | Derivative Instruments
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Total before tax	828	(18,388)	(8,261)	15,825
Income taxes	(134)	4,549	1,649	(4,476)
Net income attributable to Darling	694	(13,839)	(6,612)	11,349
Reclassification out of Accumulated Other Comprehensive Income [Member] | Derivative Instruments | Soybean Meal
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Net sales	0	0	0	33
Reclassification out of Accumulated Other Comprehensive Income [Member] | Derivative Instruments | Foreign Exchange Contract
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Net sales	(723)	(924)	3,790	6,471
Reclassification out of Accumulated Other Comprehensive Income [Member] | Derivative Instruments | Corn Option
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Cost of sales and operating expenses (excludes depreciation and amortization, shown separately below)	0	605	(385)	605
Reclassification out of Accumulated Other Comprehensive Income [Member] | Derivative Instruments | Interest Rate Swap
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Foreign currency gain/(loss)	1,551	(18,069)	(11,666)	8,716
Reclassification out of Accumulated Other Comprehensive Income [Member] | Foreign Currency Translation
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Total before tax	(132)	(343)	(6,438)	(1,029)
Income taxes	30	81	1,559	243
Amortization of prior service cost	3	6	7	18
Amortization of actuarial loss	(122)	(349)	(578)	(1,047)
Net income attributable to Darling	(102)	(262)	(4,879)	(786)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Defined Benefit Pension Plans
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Other Comprehensive (Income) Loss, Amortization Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, Settlements, before Tax	$ (13)	$ 0	$ (5,867)	$ 0