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Other Comprehensive Income (Reclassification out of AOCI) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 30, 2019
Mar. 31, 2018
Reclassification out of Accumulated Other Comprehensive Income [Line Items]    
Net sales $ 835,104 $ 875,374
Cost of sales and operating expenses 646,663 678,099
Total before tax 24,914 101,787
Income taxes (5,274) (3,712)
Amortization of prior service cost 9 9
Amortization of actuarial loss 1,146 888
Net income attributable to Darling 18,012 97,305
Reclassification out of Accumulated Other Comprehensive Income [Member]    
Reclassification out of Accumulated Other Comprehensive Income [Line Items]    
Net income attributable to Darling (858) (182)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Derivative Instruments [Member]    
Reclassification out of Accumulated Other Comprehensive Income [Line Items]    
Total before tax 0 654
Income taxes 0 (169)
Net income attributable to Darling 0 485
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 0 (14)
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 0 668
Reclassification out of Accumulated Other Comprehensive Income [Member] | Foreign Currency Translation [Member]    
Reclassification out of Accumulated Other Comprehensive Income [Line Items]    
Total before tax (1,155) (897)
Income taxes 297 230
Amortization of prior service cost (9) (9)
Amortization of actuarial loss (1,146) (888)
Net income attributable to Darling $ (858) $ (667)