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Acquisitions (Narrative) (Details) | 3 Months Ended |  | 3 Months Ended |  | 0 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Apr. 04, 2015 USD ($) | Mar. 29, 2014 USD ($) | Jan. 03, 2015 USD ($) | Dec. 28, 2013 Common Stock [Member] USD ($) | Jan. 02, 2014 Senior Notes [Member] USD ($) | Jan. 07, 2014 Vion Ingredients [Member] USD ($) product brand continent facilities | Jan. 07, 2014 Vion Ingredients [Member] EUR (€) product brand continent facilities | Oct. 01, 2014 CustomBlendersCompany [Member] USD ($) | Oct. 01, 2014 CustomBlendersCompany [Member] USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Number of plants |  |  |  |  |  | 68 dar_NumberOfPlants / us-gaap_BusinessAcquisitionAxis = dar_VionIngredientsMember | 68 dar_NumberOfPlants / us-gaap_BusinessAcquisitionAxis = dar_VionIngredientsMember |  |
Number of continents in which entity operates |  |  |  |  |  | 5 dar_NumberofContinentsinwhichEntityOperates / us-gaap_BusinessAcquisitionAxis = dar_VionIngredientsMember | 5 dar_NumberofContinentsinwhichEntityOperates / us-gaap_BusinessAcquisitionAxis = dar_VionIngredientsMember |  |
Number of brands |  |  |  |  |  | 6 dar_NumberofBrandsEntityOperates / us-gaap_BusinessAcquisitionAxis = dar_VionIngredientsMember | 6 dar_NumberofBrandsEntityOperates / us-gaap_BusinessAcquisitionAxis = dar_VionIngredientsMember |  |
Number of products in portfolio (over 400) |  |  |  |  |  | 400 dar_NumberOfProductsInPortfolio / us-gaap_BusinessAcquisitionAxis = dar_VionIngredientsMember | 400 dar_NumberOfProductsInPortfolio / us-gaap_BusinessAcquisitionAxis = dar_VionIngredientsMember |  |
Purchase price of transaction |  |  |  |  |  | $ 2,200,000,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = dar_VionIngredientsMember | € 1,600,000,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = dar_VionIngredientsMember |  |
Foreign currency exchange rate, translation |  |  |  |  |  | 1.3605 us-gaap_ForeignCurrencyExchangeRateTranslation1 / us-gaap_BusinessAcquisitionAxis = dar_VionIngredientsMember | 1.3605 us-gaap_ForeignCurrencyExchangeRateTranslation1 / us-gaap_BusinessAcquisitionAxis = dar_VionIngredientsMember |  |
Stock issued, value |  |  |  | 874,000,000 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |  |  |  |  |
Face amount of debt instrument |  |  |  |  | 500,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember |  |  |  |
Payments to Acquire Businesses, Net of Cash Acquired | 0 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired | 2,081,690,000 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired |  |  |  |  |  | 18,800,000 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / us-gaap_BusinessAcquisitionAxis = dar_CustomBlendersCompanyMember |
Property and equipment |  |  |  |  |  |  |  |  | 3,200,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = dar_CustomBlendersCompanyMember
Finite-lived Intangibles assets |  |  |  |  |  |  |  |  | 8,600,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = dar_CustomBlendersCompanyMember
Goodwill | 1,255,105,000 us-gaap_Goodwill |  | 1,320,419,000 us-gaap_Goodwill |  |  |  |  |  | 5,400,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = dar_CustomBlendersCompanyMember
Inventory |  |  |  |  |  |  |  |  | $ 1,600,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory / us-gaap_BusinessAcquisitionAxis = dar_CustomBlendersCompanyMember
Weighted average useful life of identifiable intangibles |  |  |  |  |  |  |  | 14 years |

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