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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 29, 2019	Mar. 30, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 29, 2019	Jun. 30, 2018
Net income/(loss)	$ 31,044	$ 19,640	$ (29,138)	$ 98,075	$ 50,684	$ 68,937
Other comprehensive income/(loss), net of tax:
Foreign currency translation	16,326	(4,886)	(76,837)	17,295	11,440	(59,542)
Pension adjustments	859		666		1,717	1,333
Net current-period other comprehensive income	20,791		(75,724)		14,826	(59,345)
Total comprehensive income/(loss)	51,835		(104,862)		65,510	9,592
Comprehensive income attributable to noncontrolling interests	3,315		1,232		6,702	2,519
Comprehensive income/(loss) attributable to Darling	48,520		(106,094)		58,808	7,073
Natural Gas Swap [Member]
Other comprehensive income/(loss), net of tax:
Derivative adjustments	0		0	22	0	22
Corn Option [Member]
Other comprehensive income/(loss), net of tax:
Derivative adjustments	22		447	(1,605)	22	(1,158)
Heating Oil Swaps And Options [Member]
Other comprehensive income/(loss), net of tax:
Derivative adjustments	2,133		0		2,133	0
Foreign Exchange Contract [Member]
Other comprehensive income/(loss), net of tax:
Derivative adjustments	1,451	(1,937)	0		$ (486)	$ 0
Parent [Member]
Net income/(loss)	26,258	18,012	(30,420)	97,305
Other comprehensive income/(loss), net of tax:
Foreign currency translation	17,797	(6,645)	(76,787)	16,778
Parent [Member] \| Natural Gas Swap [Member]
Other comprehensive income/(loss), net of tax:
Derivative adjustments				22
Parent [Member] \| Corn Option [Member]
Other comprehensive income/(loss), net of tax:
Derivative adjustments	22		$ 447	$ (1,605)
Parent [Member] \| Foreign Exchange Contract [Member]
Other comprehensive income/(loss), net of tax:
Derivative adjustments	$ 1,451	$ (1,937)