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Employee Benefit Plans Employee Benefit Plans Narrative 2 (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Jan. 03, 2015
plan
Dec. 28, 2013
Dec. 29, 2012
Employee Benefit Plans [Line Items]      
Defined Benefit Plan, Number of Plans 2dar_DefinedBenefitPlanNumberofPlans    
Expected long-term rate of return on assets 5.06%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets 7.35%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets 7.35%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year $ 6.5us-gaap_DefinedBenefitPlansEstimatedFutureEmployerContributionsInNextFiscalYear    
Equity Funds [Member]      
Employee Benefit Plans [Line Items]      
Equity Securities 60.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_EquityFundsMember
   
Fixed Income Funds [Member]      
Employee Benefit Plans [Line Items]      
Equity Securities 40.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_FixedIncomeFundsMember
   
United States Postretirement Benefit Plan of US Entity [Member]      
Employee Benefit Plans [Line Items]      
Expected long-term rate of return on assets 7.10%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_UnitedStatesPostretirementBenefitPlansOfUSEntityDefinedBenefitMember
   
Foreign Pension Plan [Member]      
Employee Benefit Plans [Line Items]      
Expected long-term rate of return on assets 3.80%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_ForeignPensionPlansDefinedBenefitMember
   
Emerging Market [Member] | Equity Securities, International [Member]      
Employee Benefit Plans [Line Items]      
Concentration Risk, Percentage 10.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByTypeAxis
= dar_EmergingMarketMember
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= dar_EquitySecuritiesInternationalMember