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Investment in Unconsolidated Subsidiary (Details) (USD $) | 3 Months Ended | 0 Months Ended |  |
--- | --- | --- | --- | ---
Apr. 04, 2015 | Mar. 29, 2014 | Apr. 05, 2015 | Jan. 03, 2015 | Jan. 21, 2011
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Investment in the joint venture | $ 198,639,000 us-gaap_EquityMethodInvestments |  |  | $ 202,712,000 us-gaap_EquityMethodInvestments |
Income (loss) from equity method investments | (1,808,000)us-gaap_IncomeLossFromEquityMethodInvestments | 5,077,000 us-gaap_IncomeLossFromEquityMethodInvestments |  |  |
Diamond Green Diesel Holdings LLC Joint Venture [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  |  | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = dar_DiamondGreenDieselHoldingsLlcJointVentureMember
Processing cabaility | 11,000 dar_ProcessingCapabilityBarrelsofInputFeedstockPerDay / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = dar_DiamondGreenDieselHoldingsLlcJointVentureMember |  |  |  |
Line of credit term | 14 years |  |  |  |
Term loan facility | 221,300,000 us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = dar_DiamondGreenDieselHoldingsLlcJointVentureMember |  |  |  |
Investment in the joint venture | 176,700,000 us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = dar_DiamondGreenDieselHoldingsLlcJointVentureMember |  |  |  |
Income (loss) from equity method investments | (2,200,000)us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = dar_DiamondGreenDieselHoldingsLlcJointVentureMember | 4,700,000 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = dar_DiamondGreenDieselHoldingsLlcJointVentureMember |  |  |
Diamond Green Diesel Holdings LLC Joint Venture [Member] | Valero Energy Corporation [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  |  | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = dar_ValeroEnergyCorporationMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = dar_DiamondGreenDieselHoldingsLlcJointVentureMember
Subsequent Event [Member] | Diamond Green Diesel Holdings LLC Joint Venture [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Proceeds from Equity Method Investment, Dividends or Distributions |  |  | $ 25,000,000 us-gaap_EquityMethodInvestmentDividendsOrDistributions / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = dar_DiamondGreenDieselHoldingsLlcJointVentureMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |

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