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Guarantor Financial Information (Condensed Consolidated Statements of Comprehensive Income) (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Apr. 01, 2017
Net income	$ 98,075	$ 7,398
Other comprehensive income, net of tax:
Foreign currency translation	17,295	15,679
Pension adjustments	667	759
Total other comprehensive income/(loss), net of tax	16,379	15,336
Total comprehensive income	114,454	22,734
Comprehensive income attributable to noncontrolling interests	1,287	1,247
Comprehensive income attributable to Darling	113,167	21,487
Parent [Member]
Net income	98,075	7,398
Other comprehensive income, net of tax:
Foreign currency translation	0	0
Pension adjustments	566	641
Total other comprehensive income/(loss), net of tax	(1,017)	(461)
Total comprehensive income	97,058	6,937
Comprehensive income attributable to noncontrolling interests	0	0
Comprehensive income attributable to Darling	97,058	6,937
Guarantors [Member]
Net income	35,277	25,551
Other comprehensive income, net of tax:
Foreign currency translation	0	0
Pension adjustments	0	0
Total other comprehensive income/(loss), net of tax	0	0
Total comprehensive income	35,277	25,551
Comprehensive income attributable to noncontrolling interests	0	0
Comprehensive income attributable to Darling	35,277	25,551
Non-guarantors [Member]
Net income	109,603	12,767
Other comprehensive income, net of tax:
Foreign currency translation	17,295	15,679
Pension adjustments	101	118
Total other comprehensive income/(loss), net of tax	17,396	15,797
Total comprehensive income	126,999	28,564
Comprehensive income attributable to noncontrolling interests	1,287	1,247
Comprehensive income attributable to Darling	125,712	27,317
Natural Gas Swap [Member]
Other comprehensive income, net of tax:
Derivative adjustments	22	0
Natural Gas Swap [Member] | Parent [Member]
Other comprehensive income, net of tax:
Derivative adjustments	22
Natural Gas Swap [Member] | Guarantors [Member]
Other comprehensive income, net of tax:
Derivative adjustments	0
Natural Gas Swap [Member] | Non-guarantors [Member]
Other comprehensive income, net of tax:
Derivative adjustments	0
Corn Option [Member]
Other comprehensive income, net of tax:
Derivative adjustments	(1,605)	(1,102)
Corn Option [Member] | Parent [Member]
Other comprehensive income, net of tax:
Derivative adjustments	(1,605)	(1,102)
Corn Option [Member] | Guarantors [Member]
Other comprehensive income, net of tax:
Derivative adjustments	0	0
Corn Option [Member] | Non-guarantors [Member]
Other comprehensive income, net of tax:
Derivative adjustments	0	0
Eliminations [Member]
Net income	(144,880)	(38,318)
Other comprehensive income, net of tax:
Foreign currency translation	0	0
Pension adjustments	0	0
Derivative adjustments	0	0
Total other comprehensive income/(loss), net of tax	0	0
Total comprehensive income	(144,880)	(38,318)
Comprehensive income attributable to noncontrolling interests	0	0
Comprehensive income attributable to Darling	(144,880)	$ (38,318)
Eliminations [Member] | Natural Gas Swap [Member]
Other comprehensive income, net of tax:
Derivative adjustments	$ 0

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