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Summary of Significant Accounting Policies (Details) (USD $)
3 Months Ended
Apr. 04, 2015
Mar. 29, 2014
Summary of Significant Accounting Policies [Line Items]    
Minimum fiscal year period in days 364 days  
Maximum fiscal year period in days 371 days  
Fiscal quarter period in days 91 days 91 days
Foreign currency translation $ 98,642,000us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax $ (20,615,000)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
Foreign currency gains/ (losses) 2,460,000us-gaap_ForeignCurrencyTransactionGainLossBeforeTax 13,814,000us-gaap_ForeignCurrencyTransactionGainLossBeforeTax
Basic:    
Net income 109,000us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic (52,803,000)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Shares 164,882,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 164,386,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Per Share $ 0.00us-gaap_EarningsPerShareBasic $ (0.32)us-gaap_EarningsPerShareBasic
Effect of dilutive securities: [Abstract]    
Add: Option shares in the money and dilutive effect of non-vested stock 419,000dar_OptionSharesInMoneyAndDilutiveEffectOfNonVestedStock 0dar_OptionSharesInMoneyAndDilutiveEffectOfNonVestedStock
Less: Pro forma treasury shares (155,000)dar_ProFormaTreasuryShares 0dar_ProFormaTreasuryShares
Diluted:    
Net Income 109,000us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted (52,803,000)us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
Shares 165,146,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 164,386,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Per Share $ 0.00us-gaap_EarningsPerShareDiluted $ (0.32)us-gaap_EarningsPerShareDiluted
Stock Options [Member]    
Antidilutive Securities [Abstract]    
Antidilutive securities excluded from computation of earnings per share (in shares) 524,483us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_EmployeeStockOptionMember
942,956us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_EmployeeStockOptionMember
Non Vested Stock [Member]    
Antidilutive Securities [Abstract]    
Antidilutive securities excluded from computation of earnings per share (in shares) 519,262us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= dar_NonVestedStockMember
856,568us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= dar_NonVestedStockMember
Net Investment Hedging [Member]    
Summary of Significant Accounting Policies [Line Items]    
Foreign currency gains/ (losses)   (12,600,000)us-gaap_ForeignCurrencyTransactionGainLossBeforeTax
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_NetInvestmentHedgingMember
Minimum [Member] | Machinery and Equipment [Member]    
Summary of Significant Accounting Policies [Line Items]    
Property, Plant and Equipment, Useful Life 3 years  
Minimum [Member] | Vehicles [Member]    
Summary of Significant Accounting Policies [Line Items]    
Property, Plant and Equipment, Useful Life 3 years  
Minimum [Member] | Air Transportation Equipment [Member]    
Summary of Significant Accounting Policies [Line Items]    
Property, Plant and Equipment, Useful Life 7 years  
Minimum [Member] | Building and Building Improvements [Member]    
Summary of Significant Accounting Policies [Line Items]    
Property, Plant and Equipment, Useful Life 15 years  
Maximum [Member] | Machinery and Equipment [Member]    
Summary of Significant Accounting Policies [Line Items]    
Property, Plant and Equipment, Useful Life 10 years  
Maximum [Member] | Vehicles [Member]    
Summary of Significant Accounting Policies [Line Items]    
Property, Plant and Equipment, Useful Life 8 years  
Maximum [Member] | Air Transportation Equipment [Member]    
Summary of Significant Accounting Policies [Line Items]    
Property, Plant and Equipment, Useful Life 10 years  
Maximum [Member] | Building and Building Improvements [Member]    
Summary of Significant Accounting Policies [Line Items]    
Property, Plant and Equipment, Useful Life 30 years  
Permits [Member] | Minimum [Member]    
Summary of Significant Accounting Policies [Line Items]    
Finite lived intangible assets, useful life 10 years  
Permits [Member] | Maximum [Member]    
Summary of Significant Accounting Policies [Line Items]    
Finite lived intangible assets, useful life 20 years  
Noncompete Agreements [Member] | Minimum [Member]    
Summary of Significant Accounting Policies [Line Items]    
Finite lived intangible assets, useful life 3 years  
Noncompete Agreements [Member] | Maximum [Member]    
Summary of Significant Accounting Policies [Line Items]    
Finite lived intangible assets, useful life 7 years  
Trade Names [Member]    
Summary of Significant Accounting Policies [Line Items]    
Trade name, Gross $ 65,100,000us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember
 
Finite lived intangible assets, useful life 10 years  
Trade Names [Member] | Minimum [Member]    
Summary of Significant Accounting Policies [Line Items]    
Finite lived intangible assets, useful life 4 years  
Trade Names [Member] | Maximum [Member]    
Summary of Significant Accounting Policies [Line Items]    
Finite lived intangible assets, useful life 15 years  
Collection Routes [Member] | Minimum [Member]    
Summary of Significant Accounting Policies [Line Items]    
Finite lived intangible assets, useful life 5 years  
Collection Routes [Member] | Maximum [Member]    
Summary of Significant Accounting Policies [Line Items]    
Finite lived intangible assets, useful life 21 years