XML 34 R87.htm IDEA: XBRL DOCUMENT v2.4.1.9
Employee Benefit Plans (Details) (USD $)
 12 Months Ended
Jan. 03, 2015
Dec. 28, 2013
Dec. 29, 2012
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Business Combinations and Acquisitions, Plan Assets $ 171,117,000us-gaap_DefinedBenefitPlanBusinessCombinationsAndAcquisitionsPlanAssets $ 0us-gaap_DefinedBenefitPlanBusinessCombinationsAndAcquisitionsPlanAssets  
Change in projected benefit obligation:      
Projected benefit obligation at beginning of period 129,966,000us-gaap_DefinedBenefitPlanBenefitObligation 137,797,000us-gaap_DefinedBenefitPlanBenefitObligation  
Acquisitions 199,996,000dar_DefinedBenefitPlanAcquisitionCost 4,102,000dar_DefinedBenefitPlanAcquisitionCost  
Service cost 5,208,000us-gaap_DefinedBenefitPlanServiceCost 507,000us-gaap_DefinedBenefitPlanServiceCost 326,000us-gaap_DefinedBenefitPlanServiceCost
Interest cost 13,214,000us-gaap_DefinedBenefitPlanInterestCost 5,307,000us-gaap_DefinedBenefitPlanInterestCost 5,451,000us-gaap_DefinedBenefitPlanInterestCost
Employee contributions 1,946,000us-gaap_DefinedBenefitPlanContributionsByPlanParticipants 20,000us-gaap_DefinedBenefitPlanContributionsByPlanParticipants  
Plan amendments (1,371,000)us-gaap_DefinedBenefitPlanPlanAmendments 0us-gaap_DefinedBenefitPlanPlanAmendments  
Actuarial loss 88,592,000us-gaap_DefinedBenefitPlanActuarialGainLoss (12,904,000)us-gaap_DefinedBenefitPlanActuarialGainLoss  
Benefits paid (13,045,000)us-gaap_DefinedBenefitPlanBenefitsPaid (4,761,000)us-gaap_DefinedBenefitPlanBenefitsPaid  
Other (29,364,000)us-gaap_DefinedBenefitPlanOtherChanges (102,000)us-gaap_DefinedBenefitPlanOtherChanges  
Projected benefit obligation at end of period 395,142,000us-gaap_DefinedBenefitPlanBenefitObligation 129,966,000us-gaap_DefinedBenefitPlanBenefitObligation 137,797,000us-gaap_DefinedBenefitPlanBenefitObligation
Change in plan assets:      
Fair value of plan assets at beginning of period 118,898,000us-gaap_DefinedBenefitPlanFairValueOfPlanAssets 106,519,000us-gaap_DefinedBenefitPlanFairValueOfPlanAssets  
Actual return on plan assets 67,090,000us-gaap_DefinedBenefitPlanActualReturnOnPlanAssets 13,147,000us-gaap_DefinedBenefitPlanActualReturnOnPlanAssets  
Employer contributions 7,061,000us-gaap_DefinedBenefitPlanContributionsByEmployer 3,973,000us-gaap_DefinedBenefitPlanContributionsByEmployer  
Benefits paid (13,045,000)us-gaap_DefinedBenefitPlanBenefitsPaid (4,761,000)us-gaap_DefinedBenefitPlanBenefitsPaid  
Other (24,847,000)us-gaap_DefinedBenefitPlanOtherCosts 0us-gaap_DefinedBenefitPlanOtherCosts  
Fair value of plan assets at end of period 328,220,000us-gaap_DefinedBenefitPlanFairValueOfPlanAssets 118,898,000us-gaap_DefinedBenefitPlanFairValueOfPlanAssets 106,519,000us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
Funded status (66,922,000)us-gaap_DefinedBenefitPlanFundedStatusOfPlan (11,068,000)us-gaap_DefinedBenefitPlanFundedStatusOfPlan  
Amounts recognized in the consolidated balance sheets consist of:      
Noncurrent assets 0us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent 29,000us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent  
Current liability (993,000)us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities 0us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities  
Noncurrent liability (65,929,000)us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent (11,097,000)us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent  
Net amount recognized (66,922,000)us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet (11,068,000)us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet  
Amounts recognized in accumulated other comprehensive loss consist of:      
Net actuarial loss 59,207,000us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax 26,738,000us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax  
Prior service cost/(credit) (1,131,000)us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax 32,000us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax  
Net amount recognized 58,076,000us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax [1] 26,770,000us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax [1]  
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Tax 21,300,000us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax 10,400,000us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax  
Accumulated benefit obligation 376,043,000us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation 125,939,000us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation  
Net pension cost includes the following components:      
Service cost 5,208,000us-gaap_DefinedBenefitPlanServiceCost 507,000us-gaap_DefinedBenefitPlanServiceCost 326,000us-gaap_DefinedBenefitPlanServiceCost
Interest cost 13,214,000us-gaap_DefinedBenefitPlanInterestCost 5,307,000us-gaap_DefinedBenefitPlanInterestCost 5,451,000us-gaap_DefinedBenefitPlanInterestCost
Expected return on plan assets (14,439,000)us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets (7,277,000)us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets (6,709,000)us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets
Net amortization and deferral 2,094,000dar_DefinedBenefitPlanNetAmortizationAndDeferral 5,261,000dar_DefinedBenefitPlanNetAmortizationAndDeferral 4,845,000dar_DefinedBenefitPlanNetAmortizationAndDeferral
Curtailment 7,000us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToCurtailments 83,000us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToCurtailments 14,000us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToCurtailments
Net pension cost 6,084,000us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost 3,881,000us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost 3,927,000us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost
Amounts recognized in accumulated other comprehensive income (loss):      
Amortization of actuarial loss 1,272,000us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax 3,184,000us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax 2,912,000us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax
Actuarial (loss)/gain recognized (22,546,000)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax 11,869,000us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax (4,145,000)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax
Amortization of prior service costs 14,000us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax 87,000us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax 64,000us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax
Actuarial prior service cost recognized 879,000us-gaap_OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostsCreditArisingDuringPeriodNetOfTax 0us-gaap_OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostsCreditArisingDuringPeriodNetOfTax 0us-gaap_OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostsCreditArisingDuringPeriodNetOfTax
Amounts recognized in accumulated other comprehensive income (loss) (20,381,000)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax 15,140,000us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax  
Estimated amount that will be amortized from accumulated other comprehensive loss into net periodic pension cost in fiscal 2012:      
Net actuarial loss 5,142,000us-gaap_DefinedBenefitPlanFutureAmortizationOfGainLoss    
Prior service cost (81,000)us-gaap_DefinedBenefitPlanFutureAmortizationOfPriorServiceCostCredit    
Total 5,061,000us-gaap_DefinedBenefitPlanAmountToBeAmortizedFromAccumulatedOtherComprehensiveIncomeLossNextFiscalYear    
Weighted average assumptions used to determine benefit obligations:      
Discount rate 2.79%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate 4.66%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate 3.90%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
Rate of compensation increase 1.82%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease 3.00%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease 0.00%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease
Weighted average assumptions used to determine net periodic benefit cost for the employee benefit pension plans:      
Discount rate 4.15%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate 3.96%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate 4.50%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate
Rate of increase in future compensation levels 1.70%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncrease 0.00%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncrease 0.00%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncrease
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, Expected Future Benefit Payments, Fiscal Year Maturity [Abstract]      
2015 13,344,000us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths    
2016 14,379,000us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo    
2017 13,942,000us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree    
2018 14,466,000us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour    
2019 15,748,000us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive    
Years 2020 – 2024 87,338,000us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter    
Multiemployer Plans [Abstract]      
Contributions 3,302,000us-gaap_MultiemployerPlanPeriodContributions 3,149,000us-gaap_MultiemployerPlanPeriodContributions 3,200,000us-gaap_MultiemployerPlanPeriodContributions
Fair Value, Inputs, Level 1 [Member]      
Change in plan assets:      
Fair value of plan assets at end of period 76,518,000us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 77,508,000us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		  
Fair Value, Inputs, Level 2 [Member]      
Change in plan assets:      
Fair value of plan assets at end of period 56,793,000us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 41,390,000us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		  
Fair Value, Inputs, Level 3 [Member]      
Change in plan assets:      
Fair value of plan assets at end of period 194,909,000us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 0us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		  
Fixed Income, Long Term [Member]      
Change in plan assets:      
Fair value of plan assets at end of period 71,820,000us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= dar_FixedIncomeLongTermMember		 60,654,000us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= dar_FixedIncomeLongTermMember		  
Fixed Income, Long Term [Member] | Fair Value, Inputs, Level 1 [Member]      
Change in plan assets:      
Fair value of plan assets at end of period 23,619,000us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= dar_FixedIncomeLongTermMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 22,906,000us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= dar_FixedIncomeLongTermMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		  
Fixed Income, Long Term [Member] | Fair Value, Inputs, Level 2 [Member]      
Change in plan assets:      
Fair value of plan assets at end of period 48,201,000us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= dar_FixedIncomeLongTermMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 37,748,000us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= dar_FixedIncomeLongTermMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		  
Fixed Income, Long Term [Member] | Fair Value, Inputs, Level 3 [Member]      
Change in plan assets:      
Fair value of plan assets at end of period 0us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= dar_FixedIncomeLongTermMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 0us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= dar_FixedIncomeLongTermMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		  
Fixed Income, Short Term [Member]      
Change in plan assets:      
Fair value of plan assets at end of period 1,419,000us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= dar_FixedIncomeShortTermMember		 771,000us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= dar_FixedIncomeShortTermMember		  
Fixed Income, Short Term [Member] | Fair Value, Inputs, Level 1 [Member]      
Change in plan assets:      
Fair value of plan assets at end of period 0us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= dar_FixedIncomeShortTermMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 0us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= dar_FixedIncomeShortTermMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		  
Fixed Income, Short Term [Member] | Fair Value, Inputs, Level 2 [Member]      
Change in plan assets:      
Fair value of plan assets at end of period 1,419,000us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= dar_FixedIncomeShortTermMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 771,000us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= dar_FixedIncomeShortTermMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		  
Fixed Income, Short Term [Member] | Fair Value, Inputs, Level 3 [Member]      
Change in plan assets:      
Fair value of plan assets at end of period 0us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= dar_FixedIncomeShortTermMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 0us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= dar_FixedIncomeShortTermMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		  
Equity Securities, Domestic [Member]      
Change in plan assets:      
Fair value of plan assets at end of period 41,813,000us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= dar_EquitySecuritiesDomesticMember		 40,028,000us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= dar_EquitySecuritiesDomesticMember		  
Equity Securities, Domestic [Member] | Fair Value, Inputs, Level 1 [Member]      
Change in plan assets:      
Fair value of plan assets at end of period 35,946,000us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= dar_EquitySecuritiesDomesticMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 38,137,000us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= dar_EquitySecuritiesDomesticMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		  
Equity Securities, Domestic [Member] | Fair Value, Inputs, Level 2 [Member]      
Change in plan assets:      
Fair value of plan assets at end of period 5,867,000us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= dar_EquitySecuritiesDomesticMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 1,891,000us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= dar_EquitySecuritiesDomesticMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		  
Equity Securities, Domestic [Member] | Fair Value, Inputs, Level 3 [Member]      
Change in plan assets:      
Fair value of plan assets at end of period 0us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= dar_EquitySecuritiesDomesticMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 0us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= dar_EquitySecuritiesDomesticMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		  
Equity Securities, International [Member]      
Change in plan assets:      
Fair value of plan assets at end of period 18,259,000us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= dar_EquitySecuritiesInternationalMember		 17,445,000us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= dar_EquitySecuritiesInternationalMember		  
Equity Securities, International [Member] | Fair Value, Inputs, Level 1 [Member]      
Change in plan assets:      
Fair value of plan assets at end of period 16,953,000us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= dar_EquitySecuritiesInternationalMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 16,465,000us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= dar_EquitySecuritiesInternationalMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		  
Equity Securities, International [Member] | Fair Value, Inputs, Level 2 [Member]      
Change in plan assets:      
Fair value of plan assets at end of period 1,306,000us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= dar_EquitySecuritiesInternationalMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 980,000us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= dar_EquitySecuritiesInternationalMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		  
Equity Securities, International [Member] | Fair Value, Inputs, Level 3 [Member]      
Change in plan assets:      
Fair value of plan assets at end of period 0us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= dar_EquitySecuritiesInternationalMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 0us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= dar_EquitySecuritiesInternationalMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		  
Insurance Contracts [Member]      
Change in plan assets:      
Fair value of plan assets at end of period 194,909,000us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= dar_InsuranceContractsMember		    
Insurance Contracts [Member] | Fair Value, Inputs, Level 1 [Member]      
Change in plan assets:      
Fair value of plan assets at end of period 0us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= dar_InsuranceContractsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		    
Insurance Contracts [Member] | Fair Value, Inputs, Level 2 [Member]      
Change in plan assets:      
Fair value of plan assets at end of period 0us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= dar_InsuranceContractsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		    
Insurance Contracts [Member] | Fair Value, Inputs, Level 3 [Member]      
Change in plan assets:      
Fair value of plan assets at end of period 194,909,000us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= dar_InsuranceContractsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		    
Western Conference Of Teamsters Pension Plan [Member]      
Multiemployer Plans [Abstract]      
Contributions 1,384,000us-gaap_MultiemployerPlanPeriodContributions
/ us-gaap_MultiemployerPlanNameAxis
= dar_WesternConferenceOfTeamstersPensionPlanMember		 [2] 1,254,000us-gaap_MultiemployerPlanPeriodContributions
/ us-gaap_MultiemployerPlanNameAxis
= dar_WesternConferenceOfTeamstersPensionPlanMember		 [2] 1,371,000us-gaap_MultiemployerPlanPeriodContributions
/ us-gaap_MultiemployerPlanNameAxis
= dar_WesternConferenceOfTeamstersPensionPlanMember		 [2]
Central States, Southeast and Southwest Areas Pension Plan [Member]      
Multiemployer Plans [Abstract]      
Contributions 876,000us-gaap_MultiemployerPlanPeriodContributions
/ us-gaap_MultiemployerPlanNameAxis
= dar_CentralStatesSoutheastAndSouthwestAreasPensionPlanMember		 [3],[4] 782,000us-gaap_MultiemployerPlanPeriodContributions
/ us-gaap_MultiemployerPlanNameAxis
= dar_CentralStatesSoutheastAndSouthwestAreasPensionPlanMember		 [3],[4] 746,000us-gaap_MultiemployerPlanPeriodContributions
/ us-gaap_MultiemployerPlanNameAxis
= dar_CentralStatesSoutheastAndSouthwestAreasPensionPlanMember		 [3],[4]
Other Multiemployer Plans [Member]      
Multiemployer Plans [Abstract]      
Contributions $ 1,042,000us-gaap_MultiemployerPlanPeriodContributions
/ us-gaap_MultiemployerPlanNameAxis
= dar_OtherMultiemployerPlansMember		 $ 1,113,000us-gaap_MultiemployerPlanPeriodContributions
/ us-gaap_MultiemployerPlanNameAxis
= dar_OtherMultiemployerPlansMember		 $ 1,083,000us-gaap_MultiemployerPlanPeriodContributions
/ us-gaap_MultiemployerPlanNameAxis
= dar_OtherMultiemployerPlansMember
Maximum [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Multiemployer Plan, Contributions To Individual Plan, Percent 5.00%dar_MultiemployerPlanContributionsToIndividualPlanPercent
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		    
[1] Amounts do not include deferred taxes of $21.3 million and $10.4 million at January 3, 2015 and December 28, 2013, respectively.
[2] The Company has several plants that participate in the Western Conference of Teamsters Pension Plan under collective bargaining agreements that require minimum funding contributions. Certain of these agreements have expired and are being renegotiated with others having expiration dates through January 1, 2017.
[3] In July 2005 this plan received a 10 year extension from the IRS for amortizing unfunded liabilities.
[4] The Company has several processing plants that participate in the Central States, Southeast and Southwest Areas Pension Plan under collective bargaining agreements that require minimum funding contributions. Certain of these agreements have expired and are being renegotiated with others having expiration dates through May 1, 2016.