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Derivatives (Gain (Loss) on Derivatives) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Apr. 04, 2015
Mar. 29, 2014
Derivative Instruments, Gain (Loss) [Line Items]    
Gain or (Loss) Recognized in OCI on Derivatives (Effective Portion) $ 296us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet [1] $ (1,147)us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet [1]
Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion) 234us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet [2] 1,649us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet [2]
Gain or (Loss) Recognized in Income on Derivatives (Ineffective Portion and Amount Excluded from Effectiveness Testing) 55us-gaap_DerivativeInstrumentsGainRecognizedInIncomeIneffectivePortionAndAmountExcludedFromEffectivenessTesting [3] 377us-gaap_DerivativeInstrumentsGainRecognizedInIncomeIneffectivePortionAndAmountExcludedFromEffectivenessTesting [3]
Loss activity recognized in other comprehensive loss 300us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax 1,100us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax (100)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax 400us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax
Corn Option [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Loss activity recognized in other comprehensive loss 296us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax
/ us-gaap_DerivativeInstrumentRiskAxis
= dar_CornOptionMember		 (1,319)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax
/ us-gaap_DerivativeInstrumentRiskAxis
= dar_CornOptionMember
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax 115us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax
/ us-gaap_DerivativeInstrumentRiskAxis
= dar_CornOptionMember		 (512)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax
/ us-gaap_DerivativeInstrumentRiskAxis
= dar_CornOptionMember
Corn Option [Member] | Cash Flow Hedging [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain or (Loss) Recognized in OCI on Derivatives (Effective Portion) 296us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet
/ us-gaap_DerivativeInstrumentRiskAxis
= dar_CornOptionMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember		 [1] (1,319)us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet
/ us-gaap_DerivativeInstrumentRiskAxis
= dar_CornOptionMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember		 [1]
Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion) 234us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet
/ us-gaap_DerivativeInstrumentRiskAxis
= dar_CornOptionMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember		 [2] 1,292us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet
/ us-gaap_DerivativeInstrumentRiskAxis
= dar_CornOptionMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember		 [2]
Gain or (Loss) Recognized in Income on Derivatives (Ineffective Portion and Amount Excluded from Effectiveness Testing) 55us-gaap_DerivativeInstrumentsGainRecognizedInIncomeIneffectivePortionAndAmountExcludedFromEffectivenessTesting
/ us-gaap_DerivativeInstrumentRiskAxis
= dar_CornOptionMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember		 [3] 376us-gaap_DerivativeInstrumentsGainRecognizedInIncomeIneffectivePortionAndAmountExcludedFromEffectivenessTesting
/ us-gaap_DerivativeInstrumentRiskAxis
= dar_CornOptionMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember		 [3]
Natural Gas Swap [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Loss activity recognized in other comprehensive loss 0us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax
/ us-gaap_DerivativeInstrumentRiskAxis
= dar_NaturalGasSwapMember		 172us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax
/ us-gaap_DerivativeInstrumentRiskAxis
= dar_NaturalGasSwapMember
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax 0us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax
/ us-gaap_DerivativeInstrumentRiskAxis
= dar_NaturalGasSwapMember		 67us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax
/ us-gaap_DerivativeInstrumentRiskAxis
= dar_NaturalGasSwapMember
Natural Gas Swap [Member] | Cash Flow Hedging [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain or (Loss) Recognized in OCI on Derivatives (Effective Portion) 0us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet
/ us-gaap_DerivativeInstrumentRiskAxis
= dar_NaturalGasSwapMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember		 [1] 172us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet
/ us-gaap_DerivativeInstrumentRiskAxis
= dar_NaturalGasSwapMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember		 [1]
Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion) 0us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet
/ us-gaap_DerivativeInstrumentRiskAxis
= dar_NaturalGasSwapMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember		 [2] 357us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet
/ us-gaap_DerivativeInstrumentRiskAxis
= dar_NaturalGasSwapMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember		 [2]
Gain or (Loss) Recognized in Income on Derivatives (Ineffective Portion and Amount Excluded from Effectiveness Testing) $ 0us-gaap_DerivativeInstrumentsGainRecognizedInIncomeIneffectivePortionAndAmountExcludedFromEffectivenessTesting
/ us-gaap_DerivativeInstrumentRiskAxis
= dar_NaturalGasSwapMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember		 [3] $ 1us-gaap_DerivativeInstrumentsGainRecognizedInIncomeIneffectivePortionAndAmountExcludedFromEffectivenessTesting
/ us-gaap_DerivativeInstrumentRiskAxis
= dar_NaturalGasSwapMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember		 [3]
[1] Amount recognized in accumulated OCI (effective portion) is reported as accumulated other comprehensive income/(loss) of approximately $0.3 million and approximately $1.1 million recorded net of taxes of approximately $0.1 million and $0.4 million as of April 4, 2015 and March 29, 2014, respectively.
[2] Gains and (losses) reclassified from accumulated OCI into income (effective portion) for corn options and natural gas swaps are included in cost of sales, respectively, in the Company’s consolidated statements of operations.
[3] Gains and (losses) recognized in income on derivatives (ineffective portion) for corn options and natural gas swaps is included in other income/ (expense), net in the Company’s consolidated statements of operations.