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Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 03, 2015	Dec. 28, 2013	Dec. 29, 2012
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ 68,311us-gaap_ProfitLoss	$ 108,967us-gaap_ProfitLoss	$ 130,770us-gaap_ProfitLoss
Other comprehensive income (Loss), net of tax:
Foreign currency translation	(125,884)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	(14,502)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	0us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent
Pension adjustments	(20,381)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	15,140us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	(1,169)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent
Total other comprehensive income/(loss), net of tax	(147,637)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest	1,906us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest	(425)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest
Total comprehensive income/(loss)	(79,326)us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	110,873us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	130,345us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
Comprehensive income attributable to noncontrolling interests	6,200us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	0us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	0us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest
Comprehensive income/(loss) attributable to Darling	(73,126)us-gaap_ComprehensiveIncomeNetOfTax	110,873us-gaap_ComprehensiveIncomeNetOfTax	130,345us-gaap_ComprehensiveIncomeNetOfTax
Natural Gas Swap [Member]
Other comprehensive income (Loss), net of tax:
Total natural gas derivatives	(113)us-gaap_OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPortionAttributableToParent / us-gaap_DerivativeInstrumentRiskAxis = dar_NaturalGasSwapMember	127us-gaap_OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPortionAttributableToParent / us-gaap_DerivativeInstrumentRiskAxis = dar_NaturalGasSwapMember	391us-gaap_OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPortionAttributableToParent / us-gaap_DerivativeInstrumentRiskAxis = dar_NaturalGasSwapMember
Corn Option [Member]
Other comprehensive income (Loss), net of tax:
Total natural gas derivatives	(1,259)us-gaap_OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPortionAttributableToParent / us-gaap_DerivativeInstrumentRiskAxis = dar_CornOptionMember	1,141us-gaap_OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPortionAttributableToParent / us-gaap_DerivativeInstrumentRiskAxis = dar_CornOptionMember	194us-gaap_OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPortionAttributableToParent / us-gaap_DerivativeInstrumentRiskAxis = dar_CornOptionMember
Interest Rate Swap [Member]
Other comprehensive income (Loss), net of tax:
Total natural gas derivatives	$ 0us-gaap_OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPortionAttributableToParent / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember	$ 0us-gaap_OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPortionAttributableToParent / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember	$ 159us-gaap_OtherComprehensiveIncomeDerivativesQualifyingAsHedgesNetOfTaxPortionAttributableToParent / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember

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