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Consolidated Statements of Comprehensive Income - 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
Net income/(loss)	$ 26,837	$ 31,044	$ 19,640	$ (5,137)	$ (29,138)	$ 98,075	$ 77,521	$ 63,800
Other comprehensive income/(loss), net of tax:
Foreign currency translation	(47,626)	16,326	(4,886)	(5,584)	(76,837)	17,295	(36,186)	(65,126)
Pension adjustments	859			668			2,576	2,001
Net current-period other comprehensive income	(52,841)			(4,644)			(38,015)	(63,989)
Total comprehensive income/(loss)	(26,004)			(9,781)			39,506	(189)
Comprehensive income attributable to noncontrolling interests	1,120			(538)			7,822	1,981
Comprehensive income/(loss) attributable to Darling	(27,124)			(9,243)			31,684	(2,170)
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	553	22		(40)	447	(1,605)	575	(1,198)
Heating Oil Swaps And Options [Member]
Other comprehensive income/(loss), net of tax:
Derivative adjustments	(1,683)			0			450	0
Foreign Exchange Contract [Member]
Other comprehensive income/(loss), net of tax:
Derivative adjustments	(4,944)	1,451	(1,937)	309			$ (5,430)	$ 309
Parent [Member]
Net income/(loss)	25,721	26,258	18,012	(6,037)	(30,420)	97,305
Other comprehensive income/(loss), net of tax:
Foreign currency translation	(47,630)	17,797	(6,645)	(4,146)	(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	553	22		(40)	$ 447	$ (1,605)
Parent [Member] \| Foreign Exchange Contract [Member]
Other comprehensive income/(loss), net of tax:
Derivative adjustments	$ (4,944)	$ 1,451	$ (1,937)	$ 309