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Summary of Significant Accounting Policies (Details) (USD $) | 3 Months Ended
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Apr. 04, 2015 | Mar. 29, 2014
Summary of Significant Accounting Policies [Line Items] |  |
Minimum fiscal year period in days | 364 days |
Maximum fiscal year period in days | 371 days |
Fiscal quarter period in days | 91 days | 91 days
Foreign currency translation | $ 98,642,000 us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax | $ (20,615,000)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
Foreign currency gains/ (losses) | 2,460,000 us-gaap_ForeignCurrencyTransactionGainLossBeforeTax | 13,814,000 us-gaap_ForeignCurrencyTransactionGainLossBeforeTax
Basic: |  |
Net income | 109,000 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | (52,803,000)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Shares | 164,882,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 164,386,000 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Per Share | $ 0.00 us-gaap_EarningsPerShareBasic | $ (0.32)us-gaap_EarningsPerShareBasic
Effect of dilutive securities: [Abstract] |  |
Add: Option shares in the money and dilutive effect of non-vested stock | 419,000 dar_OptionSharesInMoneyAndDilutiveEffectOfNonVestedStock | 0 dar_OptionSharesInMoneyAndDilutiveEffectOfNonVestedStock
Less: Pro forma treasury shares | (155,000)dar_ProFormaTreasuryShares | 0 dar_ProFormaTreasuryShares
Diluted: |  |
Net Income | 109,000 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted | (52,803,000)us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
Shares | 165,146,000 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 164,386,000 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Per Share | $ 0.00 us-gaap_EarningsPerShareDiluted | $ (0.32)us-gaap_EarningsPerShareDiluted
Stock Options [Member] |  |
Antidilutive Securities [Abstract] |  |
Antidilutive securities excluded from computation of earnings per share (in shares) | 524,483 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_EmployeeStockOptionMember | 942,956 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 (in shares) | 519,262 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = dar_NonVestedStockMember | 856,568 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = dar_NonVestedStockMember
Net Investment Hedging [Member] |  |
Summary of Significant Accounting Policies [Line Items] |  |
Foreign currency gains/ (losses) |  | (12,600,000)us-gaap_ForeignCurrencyTransactionGainLossBeforeTax / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_NetInvestmentHedgingMember
Minimum [Member] | Machinery and Equipment [Member] |  |
Summary of Significant Accounting Policies [Line Items] |  |
Property, Plant and Equipment, Useful Life | 3 years |
Minimum [Member] | Vehicles [Member] |  |
Summary of Significant Accounting Policies [Line Items] |  |
Property, Plant and Equipment, Useful Life | 3 years |
Minimum [Member] | Air Transportation Equipment [Member] |  |
Summary of Significant Accounting Policies [Line Items] |  |
Property, Plant and Equipment, Useful Life | 7 years |
Minimum [Member] | Building and Building Improvements [Member] |  |
Summary of Significant Accounting Policies [Line Items] |  |
Property, Plant and Equipment, Useful Life | 15 years |
Maximum [Member] | Machinery and Equipment [Member] |  |
Summary of Significant Accounting Policies [Line Items] |  |
Property, Plant and Equipment, Useful Life | 10 years |
Maximum [Member] | Vehicles [Member] |  |
Summary of Significant Accounting Policies [Line Items] |  |
Property, Plant and Equipment, Useful Life | 8 years |
Maximum [Member] | Air Transportation Equipment [Member] |  |
Summary of Significant Accounting Policies [Line Items] |  |
Property, Plant and Equipment, Useful Life | 10 years |
Maximum [Member] | Building and Building Improvements [Member] |  |
Summary of Significant Accounting Policies [Line Items] |  |
Property, Plant and Equipment, Useful Life | 30 years |
Permits [Member] | Minimum [Member] |  |
Summary of Significant Accounting Policies [Line Items] |  |
Finite lived intangible assets, useful life | 10 years |
Permits [Member] | Maximum [Member] |  |
Summary of Significant Accounting Policies [Line Items] |  |
Finite lived intangible assets, useful life | 20 years |
Noncompete Agreements [Member] | Minimum [Member] |  |
Summary of Significant Accounting Policies [Line Items] |  |
Finite lived intangible assets, useful life | 3 years |
Noncompete Agreements [Member] | Maximum [Member] |  |
Summary of Significant Accounting Policies [Line Items] |  |
Finite lived intangible assets, useful life | 7 years |
Trade Names [Member] |  |
Summary of Significant Accounting Policies [Line Items] |  |
Trade name, Gross | $ 65,100,000 us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember |
Finite lived intangible assets, useful life | 10 years |
Trade Names [Member] | Minimum [Member] |  |
Summary of Significant Accounting Policies [Line Items] |  |
Finite lived intangible assets, useful life | 4 years |
Trade Names [Member] | Maximum [Member] |  |
Summary of Significant Accounting Policies [Line Items] |  |
Finite lived intangible assets, useful life | 15 years |
Collection Routes [Member] | Minimum [Member] |  |
Summary of Significant Accounting Policies [Line Items] |  |
Finite lived intangible assets, useful life | 5 years |
Collection Routes [Member] | Maximum [Member] |  |
Summary of Significant Accounting Policies [Line Items] |  |
Finite lived intangible assets, useful life | 21 years |

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Antidilution -URI http://asc.fasb.org/extlink&oid=6505113 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Diluted Earnings Per Share -URI http://asc.fasb.org/extlink&oid=6510752 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Contingent Stock Agreement -URI http://asc.fasb.org/extlink&oid=6508534 + Details
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