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Other Comprehensive Income (Schedule of AOCI) (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 28, 2019	Jun. 29, 2019	Mar. 30, 2019	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 28, 2019	Sep. 29, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax	$ (1,155)			$ (897)			$ (3,466)	$ (2,690)
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated Other Comprehensive Income/(loss) December 29, 2018, attributable to Darling, net of tax			$ (304,539)				(304,539)
Other comprehensive loss before reclassifications							(41,708)
Amounts reclassified from accumulated other comprehensive loss							3,693
Net current-period other comprehensive income/(loss)							(38,015)
Noncontrolling interest							292
Accumulated Other Comprehensive loss September 28, 2019, attributable to Darling, net of tax	(342,846)						(342,846)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax	(296)			(229)			(890)	(689)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax	(859)			(668)			(2,576)	(2,001)
Foreign currency translation	(48,954)			(5,749)
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax	(1,328)			(165)
Foreign currency translation	(47,626)	$ 16,326	(4,886)	(5,584)	$ (76,837)	$ 17,295	(36,186)	(65,126)
Other Comprehensive income (loss)	(56,546)			(4,436)			(40,865)	(64,835)
Other Comprehensive Income (Loss), Tax	(3,705)			208			(2,850)	(846)
Total other comprehensive income/(loss), net of tax	(52,841)			(4,644)			(38,015)	(63,989)
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Foreign currency translation							(37,695)	(66,407)
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax							(1,509)	(1,281)
Foreign currency translation	(47,630)	17,797	(6,645)	(4,146)	(76,787)	16,778	(36,186)	(65,126)
Foreign Currency Translation [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated Other Comprehensive Income/(loss) December 29, 2018, attributable to Darling, net of tax			(270,081)				(270,081)
Other comprehensive loss before reclassifications							(36,186)
Amounts reclassified from accumulated other comprehensive loss							0
Net current-period other comprehensive income/(loss)							(36,186)
Noncontrolling interest							292
Accumulated Other Comprehensive loss September 28, 2019, attributable to Darling, net of tax	(306,559)						(306,559)
Derivative Instruments [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated Other Comprehensive Income/(loss) December 29, 2018, attributable to Darling, net of tax			1,081				1,081
Other comprehensive loss before reclassifications							(5,522)
Amounts reclassified from accumulated other comprehensive loss							1,117
Net current-period other comprehensive income/(loss)							(4,405)
Noncontrolling interest							0
Accumulated Other Comprehensive loss September 28, 2019, attributable to Darling, net of tax	(3,324)						(3,324)
Defined Benefit Pension Plans [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated Other Comprehensive Income/(loss) December 29, 2018, attributable to Darling, net of tax			(35,539)				(35,539)
Other comprehensive loss before reclassifications							0
Amounts reclassified from accumulated other comprehensive loss							2,576
Net current-period other comprehensive income/(loss)							2,576
Noncontrolling interest							0
Accumulated Other Comprehensive loss September 28, 2019, attributable to Darling, net of tax	(32,963)						(32,963)
Natural Gas Swap [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax							0	(14)
Loss (gain) reclassified to net income							0	(3)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax							0	(11)
Gain (loss) activity recognized in other comprehensive loss							0	15
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax							0	4
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax							0	11
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, before Tax							0	29
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax							0	7
Foreign exchange derivative adjustment, net of tax	0			0		22	0	22
Natural Gas Swap [Member] | Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Foreign exchange derivative adjustment, net of tax						22
Soybean Meal [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax	0			4			0	4
Loss (gain) reclassified to net income	0			1			0	1
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	0			3			0	3
Gain (loss) activity recognized in other comprehensive loss	0			8			0	8
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax	0			2			0	2
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	0			6			0	6
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, before Tax	0			4			0	4
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax	0			1			0	1
Foreign exchange derivative adjustment, net of tax	0			3			0	3
Soybean Meal [Member] | Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Foreign exchange derivative adjustment, net of tax				3
Corn Option [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax	(206)			563			(169)	1,554
Loss (gain) reclassified to net income	(54)			147			(44)	404
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	(152)			416			(125)	1,150
Gain (loss) activity recognized in other comprehensive loss	542			507			609	(65)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax	141			131			159	(17)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	401			376			450	(48)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, before Tax	748			(56)			778	(1,619)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax	195			(16)			203	(421)
Foreign exchange derivative adjustment, net of tax	553	22		(40)	447	(1,605)	575	(1,198)
Corn Option [Member] | Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Foreign exchange derivative adjustment, net of tax	553	22		(40)	$ 447	$ (1,605)
Heating Oil Swaps And Options [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Gain (loss) activity recognized in other comprehensive loss	(2,268)			0			606	0
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax	(585)			0			156	0
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	(1,683)			0			450	0
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, before Tax	(2,268)			0			606	0
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax	(585)			0			156	0
Foreign exchange derivative adjustment, net of tax	(1,683)			0			450	0
Foreign Exchange Contract [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax	(1,178)			0			(1,465)	0
Loss (gain) reclassified to net income	(362)			0			(473)	0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	(816)			0			(992)	0
Gain (loss) activity recognized in other comprehensive loss	(8,405)			468			(9,485)	468
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax	(2,645)			159			(3,063)	159
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	(5,760)			309			(6,422)	309
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, before Tax	(7,227)			468			(8,020)	468
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax	(2,283)			159			(2,590)	159
Foreign exchange derivative adjustment, net of tax	(4,944)	1,451	(1,937)	309			$ (5,430)	$ 309
Foreign Exchange Contract [Member] | Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Foreign exchange derivative adjustment, net of tax	$ (4,944)	$ 1,451	$ (1,937)	$ 309

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