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Employee Benefit Plans Employee Benefit Plans Narrative 1 (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended | 1 Months Ended |
--- | --- | --- | ---
Jan. 03, 2015 | Dec. 28, 2013 | Dec. 29, 2012 | Jul. 31, 2005 | Jan. 07, 2014
Employee Benefit Plans [Line Items] |  |  |  |  |
Investment Horizon of Greater Than | 10 years |  |  |  |
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Tax | $ 21.3 us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax | $ 10.4 us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax |  |  |
Domestic Pension Plan Benefits Percentage Of The Projected Benefit Obligation | 37.00%dar_DomesticPensionPlanBenefitsPercentageOfTheProjectedBenefitObligation | 97.00%dar_DomesticPensionPlanBenefitsPercentageOfTheProjectedBenefitObligation |  |  |
Domestic Defined Benefit Plan Cash Contributions By Employer | 0.3 dar_DomesticDefinedBenefitPlanCashContributionsByEmployer | 4.0 dar_DomesticDefinedBenefitPlanCashContributionsByEmployer |  |  |
Foreign Defined Benefit Plan Cash Contributions By Employer | 6.8 dar_ForeignDefinedBenefitPlanCashContributionsByEmployer | 0 dar_ForeignDefinedBenefitPlanCashContributionsByEmployer |  |  |
Vion Ingredients [Member] |  |  |  |  |
Employee Benefit Plans [Line Items] |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Pension and Other Postretirement Benefit Plan Obligations |  |  |  |  | 28.9 dar_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedPensionandOtherPostretirementBenefitPlanObligations / us-gaap_BusinessAcquisitionAxis = dar_VionIngredientsMember
United States Postretirement Benefit Plan of US Entity [Member] |  |  |  |  |
Employee Benefit Plans [Line Items] |  |  |  |  |
Defined Contribution Plan, Employer Contribution Amount | 9.2 dar_DefinedContributionPlanEmployerContributionAmount / dar_EmployeeBenefitPlansAxis = us-gaap_UnitedStatesPostretirementBenefitPlansOfUSEntityDefinedBenefitMember | 8.2 dar_DefinedContributionPlanEmployerContributionAmount / dar_EmployeeBenefitPlansAxis = us-gaap_UnitedStatesPostretirementBenefitPlansOfUSEntityDefinedBenefitMember | 7.2 dar_DefinedContributionPlanEmployerContributionAmount / dar_EmployeeBenefitPlansAxis = us-gaap_UnitedStatesPostretirementBenefitPlansOfUSEntityDefinedBenefitMember |  |
Foreign Pension Plan [Member] |  |  |  |  |
Employee Benefit Plans [Line Items] |  |  |  |  |
Defined Contribution Plan, Employer Contribution Amount | $ 3.5 dar_DefinedContributionPlanEmployerContributionAmount / dar_EmployeeBenefitPlansAxis = us-gaap_ForeignPensionPlansDefinedBenefitMember | $ 0.1 dar_DefinedContributionPlanEmployerContributionAmount / dar_EmployeeBenefitPlansAxis = us-gaap_ForeignPensionPlansDefinedBenefitMember |  |  |
Equity Securities [Member] | Domestic [Member] |  |  |  |  |
Employee Benefit Plans [Line Items] |  |  |  |  |
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum | 65.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocationsRangeMaximum / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_EquitySecuritiesMember / dar_EmployeeBenefitPlansAxis = dar_DomesticMember |  |  |  |
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum | 20.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocationsRangeMinimum / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_EquitySecuritiesMember / dar_EmployeeBenefitPlansAxis = dar_DomesticMember |  |  |  |
Fixed Income Securities [Member] | Domestic [Member] |  |  |  |  |
Employee Benefit Plans [Line Items] |  |  |  |  |
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum | 80.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocationsRangeMaximum / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_FixedIncomeSecuritiesMember / dar_EmployeeBenefitPlansAxis = dar_DomesticMember |  |  |  |
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum | 35.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocationsRangeMinimum / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_FixedIncomeSecuritiesMember / dar_EmployeeBenefitPlansAxis = dar_DomesticMember |  |  |  |
Maximum [Member] |  |  |  |  |
Employee Benefit Plans [Line Items] |  |  |  |  |
Multiemployer Plan, Contributions To Individual Plan, Percent | 5.00%dar_MultiemployerPlanContributionsToIndividualPlanPercent / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |
Investment Objectives Achievement Period | 7 years |  |  |  |
Minimum [Member] |  |  |  |  |
Employee Benefit Plans [Line Items] |  |  |  |  |
Investment Objectives Achievement Period | 5 years |  |  |  |
Central States, Southeast and Southwest Areas Pension Plan [Member] |  |  |  |  |
Employee Benefit Plans [Line Items] |  |  |  |  |
Multiemployer Plans, IRS Extended Amortization Period |  |  |  | 10 years |

X
- Definition Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Pension and Other Postretirement Benefit Plan Obligations + References No definition available. + Details
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- Definition Defined Contribution Plan, Employer Contribution Amount + References No definition available. + Details
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- Definition Domestic Defined Benefit Plan Cash Contributions By Employer + References No definition available. + Details
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- Definition Domestic Pension Plan Benefits Percentage Of The Projected Benefit Obligation + References No definition available. + Details
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- Details
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- Definition Foreign Defined Benefit Plan Cash Contributions By Employer + References No definition available. + Details
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- Definition Investment Horizon of Greater Than + References No definition available. + Details
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- Definition Multiemployer Plan, Contributions To Individual Plan, Percent + References No definition available. + Details
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- Definition Multiemployer Plans, IRS Extended Amortization Period + References No definition available. + Details
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- Definition Target allocation maximum percentage of investments of this type to total plan assets presented on a weighted average basis. + 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 (d)(i) -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 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c)(i) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e2446-114920 + Details
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- Definition Target allocation minimum percentage of investments of this type to total plan assets presented on a weighted average basis. + 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 (d)(i) -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 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c)(i) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e2446-114920 + Details
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- Definition Amount of tax (expense) benefit, after reclassification adjustments, of (increase) decrease in accumulated other comprehensive (income) loss related to pension and other postretirement defined benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e640-108580 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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