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General (Details) (USD $) | 3 Months Ended | 12 Months Ended | 0 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jan. 03, 2015 segment | Sep. 27, 2014 | Jun. 28, 2014 | Mar. 29, 2014 | Dec. 28, 2013 | Sep. 28, 2013 | Jun. 29, 2013 | Mar. 30, 2013 | Jan. 03, 2015 weeks segment | Dec. 28, 2013 weeks | Dec. 29, 2012 weeks | Dec. 18, 2013 | Dec. 29, 2013 segment | Jan. 07, 2014 continent | Oct. 28, 2013
General [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Operating Segments | 3 dar_NumberOfBusinessSegments |  |  |  |  |  |  |  | 3 dar_NumberOfBusinessSegments |  |  |  | 3 dar_NumberOfBusinessSegments |  |
Accounting Policies [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number Of Weeks Year To Date |  |  |  |  |  |  |  |  | 53 dar_NumberOfWeeksYearToDate | 52 dar_NumberOfWeeksYearToDate | 52 dar_NumberOfWeeksYearToDate |  |  |  |
Cash and Cash Equivalents [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments Classified As Cash Equivalents, Original Maturity |  |  |  |  |  |  |  |  | 3 months |  |  |  |  |  |
Goodwill [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill | $ 1,320,419,000 us-gaap_Goodwill |  |  |  | $ 701,637,000 us-gaap_Goodwill |  |  |  | $ 1,320,419,000 us-gaap_Goodwill | $ 701,637,000 us-gaap_Goodwill | $ 381,369,000 us-gaap_Goodwill |  |  |  |
Basic: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 64,215,000 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 108,967,000 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 130,770,000 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic |  |  |  |
Shares |  |  |  |  |  |  |  |  | 164,627,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 119,526,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 117,592,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |  |  |  |
Basic earnings per share | $ 0.42 us-gaap_EarningsPerShareBasic | $ 0.09 us-gaap_EarningsPerShareBasic | $ 0.20 us-gaap_EarningsPerShareBasic | $ (0.32)us-gaap_EarningsPerShareBasic | $ 0.18 us-gaap_EarningsPerShareBasic | $ 0.23 us-gaap_EarningsPerShareBasic | $ 0.22 us-gaap_EarningsPerShareBasic | $ 0.27 us-gaap_EarningsPerShareBasic | $ 0.39 us-gaap_EarningsPerShareBasic | $ 0.91 us-gaap_EarningsPerShareBasic | $ 1.11 us-gaap_EarningsPerShareBasic |  |  |  |
Effect of dilutive securities: [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Add: Option shares in the money and dilutive effect of non-vested stock |  |  |  |  |  |  |  |  | 806,000 dar_OptionSharesInMoneyAndDilutiveEffectOfNonVestedStock | 848,000 dar_OptionSharesInMoneyAndDilutiveEffectOfNonVestedStock | 806,000 dar_OptionSharesInMoneyAndDilutiveEffectOfNonVestedStock |  |  |  |
Less: Pro forma treasury shares |  |  |  |  |  |  |  |  | (374,000)dar_ProFormaTreasuryShares | (450,000)dar_ProFormaTreasuryShares | (309,000)dar_ProFormaTreasuryShares |  |  |  |
Diluted: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Income |  |  |  |  |  |  |  |  | 64,215,000 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted | 108,967,000 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted | 130,770,000 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted |  |  |  |
Shares |  |  |  |  |  |  |  |  | 165,059,000 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 119,924,000 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 118,089,000 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding |  |  |  |
Per Share | $ 0.42 us-gaap_EarningsPerShareDiluted | $ 0.09 us-gaap_EarningsPerShareDiluted | $ 0.20 us-gaap_EarningsPerShareDiluted | $ (0.32)us-gaap_EarningsPerShareDiluted | $ 0.18 us-gaap_EarningsPerShareDiluted | $ 0.23 us-gaap_EarningsPerShareDiluted | $ 0.22 us-gaap_EarningsPerShareDiluted | $ 0.27 us-gaap_EarningsPerShareDiluted | $ 0.39 us-gaap_EarningsPerShareDiluted | $ 0.91 us-gaap_EarningsPerShareDiluted | $ 1.11 us-gaap_EarningsPerShareDiluted |  |  |  |
Stock Based Compensation [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense |  |  |  |  |  |  |  |  | 20,900,000 us-gaap_AllocatedShareBasedCompensationExpense | 9,400,000 us-gaap_AllocatedShareBasedCompensationExpense | 8,900,000 us-gaap_AllocatedShareBasedCompensationExpense |  |  |  |
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense |  |  |  |  |  |  |  |  | 5,900,000 us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense | 3,700,000 us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense | 3,500,000 us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense |  |  |  |
Excess tax benefits from stock-based compensation |  |  |  |  |  |  |  |  | 2,420,000 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities | 1,138,000 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities | 2,652,000 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities |  |  |  |
Financial Instruments [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt | 2,152,440,000 us-gaap_LongTermDebt |  |  |  | 886,835,000 us-gaap_LongTermDebt |  |  |  | 2,152,440,000 us-gaap_LongTermDebt | 886,835,000 us-gaap_LongTermDebt |  |  |  |  |
Foreign currency translation |  |  |  |  |  |  |  |  | (125,884,000)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent | (14,502,000)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent | 0 us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent |  |  |  |
Foreign currency gains (losses) |  |  |  | 12,600,000 us-gaap_ForeignCurrencyTransactionGainLossBeforeTax |  |  |  |  | (13,548,000)us-gaap_ForeignCurrencyTransactionGainLossBeforeTax | 28,107,000 us-gaap_ForeignCurrencyTransactionGainLossBeforeTax | 0 us-gaap_ForeignCurrencyTransactionGainLossBeforeTax |  |  |  |
Foreign Currency Transaction Gain (Loss), Unrealized |  |  |  |  | 27,500,000 us-gaap_ForeignCurrencyTransactionGainLossUnrealized |  |  |  | 0 us-gaap_ForeignCurrencyTransactionGainLossUnrealized | 27,516,000 us-gaap_ForeignCurrencyTransactionGainLossUnrealized | 0 us-gaap_ForeignCurrencyTransactionGainLossUnrealized |  |  |  |
Foreign Exchange Contract [Member] | Designated as Hedging Instrument [Member] | Other Assets [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial Instruments [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign Currency Transaction Gain (Loss), Unrealized |  |  |  |  |  |  |  |  |  | 27,500,000 us-gaap_ForeignCurrencyTransactionGainLossUnrealized / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |  |  |  |  |
Stock Options [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Antidilutive Securities [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Antidilutive securities excluded from computation of earnings per share, amount |  |  |  |  |  |  |  |  | 319,240 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_EmployeeStockOptionMember | 135,733 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_EmployeeStockOptionMember | 207,890 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_EmployeeStockOptionMember |  |  |  |
Non Vested Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Antidilutive Securities [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Antidilutive securities excluded from computation of earnings per share, amount |  |  |  |  |  |  |  |  | 751,444 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = dar_NonVestedStockMember | 57,257 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = dar_NonVestedStockMember | 105,486 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = dar_NonVestedStockMember |  |  |  |
Vion Ingredients [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
General [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected Business Combination, Number of Continents in which Entity Operates |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 dar_ExpectedBusinessCombinationNumberofContinentsinwhichEntityOperates / us-gaap_BusinessAcquisitionAxis = dar_VionIngredientsMember |
Goodwill [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  | 702,672,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = dar_VionIngredientsMember |
Rothsay [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 262,797,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = dar_RothsayMember
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
General [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Processing and Transfer Facilities | 200 dar_NumberOfProcessingAndTransferFacilities / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |  |  |  |  |  | 200 dar_NumberOfProcessingAndTransferFacilities / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |  |  |  |
Accounting Policies [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number Of Weeks Year To Date |  |  |  |  |  |  |  |  | 52 dar_NumberOfWeeksYearToDate / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |  |  |  |
Minimum [Member] | Buildings and improvements [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long Lived Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  |  |  |  |  |  |  | 15 years |  |  |  |  |  |
Minimum [Member] | Machinery and equipment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long Lived Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |  |
Minimum [Member] | Vehicles [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long Lived Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |  |
Minimum [Member] | Aircraft [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long Lived Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  |  |  |  |  |  |  | 7 years |  |  |  |  |  |
Minimum [Member] | Routes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long Lived Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Useful Life |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |
Minimum [Member] | Permits [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long Lived Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Useful Life |  |  |  |  |  |  |  |  | 10 years |  |  |  |  |  |
Minimum [Member] | Non-compete agreements [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long Lived Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Useful Life |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |  |
Minimum [Member] | Trade Names [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long Lived Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Useful Life |  |  |  |  |  |  |  |  | 4 years |  |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number Of Weeks Year To Date |  |  |  |  |  |  |  |  | 53 dar_NumberOfWeeksYearToDate / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |  |  |
Maximum [Member] | Buildings and improvements [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long Lived Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  |  |  |  |  |  |  | 30 years |  |  |  |  |  |
Maximum [Member] | Machinery and equipment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long Lived Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  |  |  |  |  |  |  | 10 years |  |  |  |  |  |
Maximum [Member] | Vehicles [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long Lived Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  |  |  |  |  |  |  | 8 years |  |  |  |  |  |
Maximum [Member] | Aircraft [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long Lived Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  |  |  |  |  |  |  | 10 years |  |  |  |  |  |
Maximum [Member] | Routes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long Lived Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Useful Life |  |  |  |  |  |  |  |  | 21 years |  |  |  |  |  |
Maximum [Member] | Permits [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long Lived Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Useful Life |  |  |  |  |  |  |  |  | 20 years |  |  |  |  |  |
Maximum [Member] | Non-compete agreements [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long Lived Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Useful Life |  |  |  |  |  |  |  |  | 7 years |  |  |  |  |  |
Maximum [Member] | Trade Names [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long Lived Assets [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Useful Life |  |  |  |  |  |  |  |  | 15 years |  |  |  |  |  |
Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock (in shares) |  |  |  |  |  |  |  |  |  |  |  | 46,000,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |  |  |
Best Hides GmbH [Member] | Vion Ingredients [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
General [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired |  |  |  |  |  |  |  |  |  |  |  |  |  | 60.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = dar_VionIngredientsMember / dei_LegalEntityAxis = dar_BestHidesGmbHMember |
Net Investment Hedging [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial Instruments [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency gains (losses) |  |  |  |  |  |  |  |  | $ (12,600,000)us-gaap_ForeignCurrencyTransactionGainLossBeforeTax / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_NetInvestmentHedgingMember |  |  |  |  |  |

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