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Income Taxes Income Taxes - Narrative (Details) (USD $) | 12 Months Ended |
--- | --- | ---
Jan. 03, 2015 | Dec. 28, 2013 | Dec. 29, 2012
Operating Loss Carryforwards [Line Items] |  |  |
Operating Loss Carryforward, Amount Relating to May 2002 Recapitalization | $ 4,900,000 dar_OperatingLossCarryforwardAmountRelatingtoMay2002Recapitalization |  |
Operating Loss Carryforwards Limitation on Use Per Year | 700,000 dar_OperatingLossCarryforwardsLimitationOnUsePerYear |  |
Deferred Tax Assets, Operating Loss Carryforwards, Not Subject to Expiration | 98,100,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsNotSubjectToExpiration |  |
Deferred Tax Assets, Operating Loss Carryforwards, Foreign | 153,200,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsForeign |  |
Deferred Tax Assets, Valuation Allowance | 1,700,000 us-gaap_TaxCreditCarryforwardValuationAllowance |  |
Operating Loss Carryforwards, Valuation Allowance | 16,300,000 us-gaap_OperatingLossCarryforwardsValuationAllowance |  |
Unrecognized Tax Benefits | 8,130,000 us-gaap_UnrecognizedTaxBenefits | 652,000 us-gaap_UnrecognizedTaxBenefits | 0 us-gaap_UnrecognizedTaxBenefits
Change in tax positions related to current year | 0 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions | 652,000 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions |
Indemnity Receivable | 6,500,000 dar_IndemnityReceivable |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit | 2,200,000 us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleAmountOfUnrecordedBenefit |  |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense | 2,500,000 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued |  |
Internal Revenue Service (IRS) |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Operating Loss Carryforwards | 82,400,000 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_InternalRevenueServiceIRSMember |  |
Foreign Tax Authority |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Tax Credit Carryforward, Amount | 900,000 us-gaap_TaxCreditCarryforwardAmount / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember |  |
State and Local Jurisdiction |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Operating Loss Carryforwards | 48,500,000 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember |  |
Tax Credit Carryforward, Amount | 800,000 us-gaap_TaxCreditCarryforwardAmount / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember |  |
Canadian Tax Authority |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Tax Credit Carryforward, Amount | 55,100,000 us-gaap_TaxCreditCarryforwardAmount / us-gaap_IncomeTaxAuthorityAxis = dar_CanadianTaxAuthorityMember |  |
Terra Transaction and Rothsay and VION Acquisition [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Change in tax positions related to current year | $ 7,400,000 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions / us-gaap_BusinessAcquisitionAxis = dar_TerraTransactionandRothsayandVIONAcquisitionMember |  |

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible foreign operating loss carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 + Details
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