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Other Comprehensive Income (Reclassification out of AOCI) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Apr. 01, 2017
Reclassification out of Accumulated Other Comprehensive Income [Line Items]    
Cost of sales and operating expenses $ 678,099 $ 687,966
Total before tax 101,787 9,216
Income taxes (3,712) (1,818)
Amortization of prior service cost 9 9
Amortization of actuarial loss 888 1,203
Net income attributable to Darling 97,305 5,829
Reclassification out of Accumulated Other Comprehensive Income [Member]    
Reclassification out of Accumulated Other Comprehensive Income [Line Items]    
Net income attributable to Darling (182) (34)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Derivative Instruments [Member]    
Reclassification out of Accumulated Other Comprehensive Income [Line Items]    
Total before tax 654 1,185
Income taxes (169) (460)
Net income attributable to Darling 485 725
Reclassification out of Accumulated Other Comprehensive Income [Member] | Derivative Instruments [Member] | Natural Gas Swap [Member]    
Reclassification out of Accumulated Other Comprehensive Income [Line Items]    
Cost of sales and operating expenses (14) 0
Reclassification out of Accumulated Other Comprehensive Income [Member] | Derivative Instruments [Member] | Corn Option [Member]    
Reclassification out of Accumulated Other Comprehensive Income [Line Items]    
Cost of sales and operating expenses 668 1,185
Reclassification out of Accumulated Other Comprehensive Income [Member] | Foreign Currency Translation [Member]    
Reclassification out of Accumulated Other Comprehensive Income [Line Items]    
Total before tax (897) (1,212)
Income taxes 230 453
Amortization of prior service cost (9) (9)
Amortization of actuarial loss (888) (1,203)
Net income attributable to Darling $ (667) $ (759)