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Employee Benefit Plans (Details) (USD $) | 12 Months Ended
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Jan. 03, 2015 | Dec. 28, 2013 | Dec. 29, 2012
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Business Combinations and Acquisitions, Plan Assets | $ 171,117,000 us-gaap_DefinedBenefitPlanBusinessCombinationsAndAcquisitionsPlanAssets |  | $ 0 us-gaap_DefinedBenefitPlanBusinessCombinationsAndAcquisitionsPlanAssets |  |  |
Change in projected benefit obligation: |  |  |  |  |  |
Projected benefit obligation at beginning of period | 129,966,000 us-gaap_DefinedBenefitPlanBenefitObligation |  | 137,797,000 us-gaap_DefinedBenefitPlanBenefitObligation |  |  |
Acquisitions | 199,996,000 dar_DefinedBenefitPlanAcquisitionCost |  | 4,102,000 dar_DefinedBenefitPlanAcquisitionCost |  |  |
Service cost | 5,208,000 us-gaap_DefinedBenefitPlanServiceCost |  | 507,000 us-gaap_DefinedBenefitPlanServiceCost |  | 326,000 us-gaap_DefinedBenefitPlanServiceCost |
Interest cost | 13,214,000 us-gaap_DefinedBenefitPlanInterestCost |  | 5,307,000 us-gaap_DefinedBenefitPlanInterestCost |  | 5,451,000 us-gaap_DefinedBenefitPlanInterestCost |
Employee contributions | 1,946,000 us-gaap_DefinedBenefitPlanContributionsByPlanParticipants |  | 20,000 us-gaap_DefinedBenefitPlanContributionsByPlanParticipants |  |  |
Plan amendments | (1,371,000)us-gaap_DefinedBenefitPlanPlanAmendments |  | 0 us-gaap_DefinedBenefitPlanPlanAmendments |  |  |
Actuarial loss | 88,592,000 us-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 | 395,142,000 us-gaap_DefinedBenefitPlanBenefitObligation |  | 129,966,000 us-gaap_DefinedBenefitPlanBenefitObligation |  | 137,797,000 us-gaap_DefinedBenefitPlanBenefitObligation |
Change in plan assets: |  |  |  |  |  |
Fair value of plan assets at beginning of period | 118,898,000 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets |  | 106,519,000 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets |  |  |
Actual return on plan assets | 67,090,000 us-gaap_DefinedBenefitPlanActualReturnOnPlanAssets |  | 13,147,000 us-gaap_DefinedBenefitPlanActualReturnOnPlanAssets |  |  |
Employer contributions | 7,061,000 us-gaap_DefinedBenefitPlanContributionsByEmployer |  | 3,973,000 us-gaap_DefinedBenefitPlanContributionsByEmployer |  |  |
Benefits paid | (13,045,000)us-gaap_DefinedBenefitPlanBenefitsPaid |  | (4,761,000)us-gaap_DefinedBenefitPlanBenefitsPaid |  |  |
Other | (24,847,000)us-gaap_DefinedBenefitPlanOtherCosts |  | 0 us-gaap_DefinedBenefitPlanOtherCosts |  |  |
Fair value of plan assets at end of period | 328,220,000 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets |  | 118,898,000 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets |  | 106,519,000 us-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 | 0 us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent |  | 29,000 us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent |  |  |
Current liability | (993,000)us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities |  | 0 us-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 | 59,207,000 us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax |  | 26,738,000 us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax |  |  |
Prior service cost/(credit) | (1,131,000)us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax |  | 32,000 us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax |  |  |
Net amount recognized | 58,076,000 us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax | [1] | 26,770,000 us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax | [1] |  |
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Tax | 21,300,000 us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax |  | 10,400,000 us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax |  |  |
Accumulated benefit obligation | 376,043,000 us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation |  | 125,939,000 us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation |  |  |
Net pension cost includes the following components: |  |  |  |  |  |
Service cost | 5,208,000 us-gaap_DefinedBenefitPlanServiceCost |  | 507,000 us-gaap_DefinedBenefitPlanServiceCost |  | 326,000 us-gaap_DefinedBenefitPlanServiceCost |
Interest cost | 13,214,000 us-gaap_DefinedBenefitPlanInterestCost |  | 5,307,000 us-gaap_DefinedBenefitPlanInterestCost |  | 5,451,000 us-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 | 2,094,000 dar_DefinedBenefitPlanNetAmortizationAndDeferral |  | 5,261,000 dar_DefinedBenefitPlanNetAmortizationAndDeferral |  | 4,845,000 dar_DefinedBenefitPlanNetAmortizationAndDeferral |
Curtailment | 7,000 us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToCurtailments |  | 83,000 us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToCurtailments |  | 14,000 us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToCurtailments |
Net pension cost | 6,084,000 us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost |  | 3,881,000 us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost |  | 3,927,000 us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost |
Amounts recognized in accumulated other comprehensive income (loss): |  |  |  |  |  |
Amortization of actuarial loss | 1,272,000 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax |  | 3,184,000 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax |  | 2,912,000 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax |
Actuarial (loss)/gain recognized | (22,546,000)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax |  | 11,869,000 us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax |  | (4,145,000)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax |
Amortization of prior service costs | 14,000 us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax |  | 87,000 us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax |  | 64,000 us-gaap_OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax |
Actuarial prior service cost recognized | 879,000 us-gaap_OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostsCreditArisingDuringPeriodNetOfTax |  | 0 us-gaap_OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostsCreditArisingDuringPeriodNetOfTax |  | 0 us-gaap_OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostsCreditArisingDuringPeriodNetOfTax |
Amounts recognized in accumulated other comprehensive income (loss) | (20,381,000)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax |  | 15,140,000 us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax |  |  |
Estimated amount that will be amortized from accumulated other comprehensive loss into net periodic pension cost in fiscal 2012: |  |  |  |  |  |
Net actuarial loss | 5,142,000 us-gaap_DefinedBenefitPlanFutureAmortizationOfGainLoss |  |  |  |  |
Prior service cost | (81,000)us-gaap_DefinedBenefitPlanFutureAmortizationOfPriorServiceCostCredit |  |  |  |  |
Total | 5,061,000 us-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 | 13,344,000 us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths |  |  |  |  |
2016 | 14,379,000 us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo |  |  |  |  |
2017 | 13,942,000 us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree |  |  |  |  |
2018 | 14,466,000 us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour |  |  |  |  |
2019 | 15,748,000 us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive |  |  |  |  |
Years 2020 – 2024 | 87,338,000 us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter |  |  |  |  |
Multiemployer Plans [Abstract] |  |  |  |  |  |
Contributions | 3,302,000 us-gaap_MultiemployerPlanPeriodContributions |  | 3,149,000 us-gaap_MultiemployerPlanPeriodContributions |  | 3,200,000 us-gaap_MultiemployerPlanPeriodContributions |
Fair Value, Inputs, Level 1 [Member] |  |  |  |  |  |
Change in plan assets: |  |  |  |  |  |
Fair value of plan assets at end of period | 76,518,000 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member |  | 77,508,000 us-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 | 56,793,000 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member |  | 41,390,000 us-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 | 194,909,000 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |  | 0 us-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 | 71,820,000 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = dar_FixedIncomeLongTermMember |  | 60,654,000 us-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 | 23,619,000 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = dar_FixedIncomeLongTermMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member |  | 22,906,000 us-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 | 48,201,000 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = dar_FixedIncomeLongTermMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member |  | 37,748,000 us-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 | 0 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = dar_FixedIncomeLongTermMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |  | 0 us-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 | 1,419,000 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = dar_FixedIncomeShortTermMember |  | 771,000 us-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 | 0 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = dar_FixedIncomeShortTermMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member |  | 0 us-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 | 1,419,000 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = dar_FixedIncomeShortTermMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member |  | 771,000 us-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 | 0 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = dar_FixedIncomeShortTermMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |  | 0 us-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 | 41,813,000 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = dar_EquitySecuritiesDomesticMember |  | 40,028,000 us-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 | 35,946,000 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = dar_EquitySecuritiesDomesticMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member |  | 38,137,000 us-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 | 5,867,000 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = dar_EquitySecuritiesDomesticMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member |  | 1,891,000 us-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 | 0 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = dar_EquitySecuritiesDomesticMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |  | 0 us-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 | 18,259,000 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = dar_EquitySecuritiesInternationalMember |  | 17,445,000 us-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 | 16,953,000 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = dar_EquitySecuritiesInternationalMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member |  | 16,465,000 us-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 | 1,306,000 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = dar_EquitySecuritiesInternationalMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member |  | 980,000 us-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 | 0 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = dar_EquitySecuritiesInternationalMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |  | 0 us-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 | 194,909,000 us-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 | 0 us-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 | 0 us-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 | 194,909,000 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = dar_InsuranceContractsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |  |  |  |  |
Western Conference Of Teamsters Pension Plan [Member] |  |  |  |  |  |
Multiemployer Plans [Abstract] |  |  |  |  |  |
Contributions | 1,384,000 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanNameAxis = dar_WesternConferenceOfTeamstersPensionPlanMember | [2] | 1,254,000 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanNameAxis = dar_WesternConferenceOfTeamstersPensionPlanMember | [2] | 1,371,000 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanNameAxis = dar_WesternConferenceOfTeamstersPensionPlanMember | [2]
Central States, Southeast and Southwest Areas Pension Plan [Member] |  |  |  |  |  |
Multiemployer Plans [Abstract] |  |  |  |  |  |
Contributions | 876,000 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanNameAxis = dar_CentralStatesSoutheastAndSouthwestAreasPensionPlanMember | [3],[4] | 782,000 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanNameAxis = dar_CentralStatesSoutheastAndSouthwestAreasPensionPlanMember | [3],[4] | 746,000 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanNameAxis = dar_CentralStatesSoutheastAndSouthwestAreasPensionPlanMember | [3],[4]
Other Multiemployer Plans [Member] |  |  |  |  |  |
Multiemployer Plans [Abstract] |  |  |  |  |  |
Contributions | $ 1,042,000 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanNameAxis = dar_OtherMultiemployerPlansMember |  | $ 1,113,000 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_MultiemployerPlanNameAxis = dar_OtherMultiemployerPlansMember |  | $ 1,083,000 us-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.

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- Definition For defined benefit pension plans, the actuarial present value of benefits (whether vested or nonvested) attributed by the pension benefit formula to employee service rendered before a specified date and based on employee service and compensation (if applicable) before that date. The accumulated benefit obligation differs from the projected benefit obligation in that it includes no assumption about future compensation levels. For plans with flat-benefit or nonpay-related pension benefit formulas, the accumulated benefit obligation and the projected benefit obligation are the same. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Accumulated Benefit Obligation -URI http://asc.fasb.org/extlink&oid=6503844 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Definition The pretax total of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i-k) -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669646-108580 + Details
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- Definition An amount calculated as a basis for determining the extent of delayed recognition of the effects of changes in the fair value of assets. The expected return on plan assets is determined based on the expected long-term rate of return on plan assets and the market-related value of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Glossary Expected Return on Plan Assets -URI http://asc.fasb.org/extlink&oid=6512136 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Glossary Expected Return on Plan Assets -URI http://asc.fasb.org/extlink&oid=6512171 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Definition Amount of contributions made to multiemployer plans by the employer. A multiemployer plan is a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=35742057&loc=SL14450702-114947 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=35742057&loc=SL14450691-114947 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=35742057&loc=SL14450657-114947 + Details
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