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Acquisitions - Recognized Assets Acquired and Liabilities Assumed (Details) (USD $)
12 Months Ended
Jan. 03, 2015
Dec. 28, 2013
Dec. 29, 2012
Jan. 07, 2014
Oct. 28, 2013
Business Acquisition [Line Items]          
Goodwill $ 1,320,419,000us-gaap_Goodwill $ 701,637,000us-gaap_Goodwill $ 381,369,000us-gaap_Goodwill    
Vion Ingredients [Member]          
Business Acquisition [Line Items]          
Business Combination Provisional Information Initial Accounting Incomplete Adjustment Working Capital 84,000,000dar_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentWorkingCapital
/ us-gaap_BusinessAcquisitionAxis
= dar_VionIngredientsMember
       
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Property, Plant, and Equipment 27,300,000us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= dar_VionIngredientsMember
       
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles 17,600,000us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentIntangibles
/ us-gaap_BusinessAcquisitionAxis
= dar_VionIngredientsMember
       
Business Combination Provisional Information Initial Accounting Incomplete Adjustment Goodwill 72,100,000dar_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentGoodwill
/ us-gaap_BusinessAcquisitionAxis
= dar_VionIngredientsMember
       
Business Combination Provisional Information Initial Accounting Incomplete Adjustment Other 27,000,000dar_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentOther
/ us-gaap_BusinessAcquisitionAxis
= dar_VionIngredientsMember
       
Accounts receivable       337,278,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables
/ us-gaap_BusinessAcquisitionAxis
= dar_VionIngredientsMember
 
Inventory       375,306,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory
/ us-gaap_BusinessAcquisitionAxis
= dar_VionIngredientsMember
 
Other current assets       23,135,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets
/ us-gaap_BusinessAcquisitionAxis
= dar_VionIngredientsMember
 
Property and equipment       981,009,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= dar_VionIngredientsMember
 
Goodwill       702,672,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= dar_VionIngredientsMember
 
Accounts payable       (210,477,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable
/ us-gaap_BusinessAcquisitionAxis
= dar_VionIngredientsMember
 
Accrued expenses       (149,345,000)dar_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccruedExpenses
/ us-gaap_BusinessAcquisitionAxis
= dar_VionIngredientsMember
 
Deferred tax liability       (350,003,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent
/ us-gaap_BusinessAcquisitionAxis
= dar_VionIngredientsMember
 
Other non-current liabilities       (57,721,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther
/ us-gaap_BusinessAcquisitionAxis
= dar_VionIngredientsMember
 
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other       3,525,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther
/ us-gaap_BusinessAcquisitionAxis
= dar_VionIngredientsMember
 
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Assets Noncurrent       48,639,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssetsNoncurrent
/ us-gaap_BusinessAcquisitionAxis
= dar_VionIngredientsMember
 
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill       464,193,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= dar_VionIngredientsMember
 
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Equity Method Investments       27,069,000dar_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedEquityMethodInvestments
/ us-gaap_BusinessAcquisitionAxis
= dar_VionIngredientsMember
 
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets       1,101,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets
/ us-gaap_BusinessAcquisitionAxis
= dar_VionIngredientsMember
 
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Long-term Debt       (26,347,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesLongTermDebt
/ us-gaap_BusinessAcquisitionAxis
= dar_VionIngredientsMember
 
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt       (4,109,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt
/ us-gaap_BusinessAcquisitionAxis
= dar_VionIngredientsMember
 
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value       (90,919,000)us-gaap_BusinessCombinationAcquisitionOfLessThan100PercentNoncontrollingInterestFairValue
/ us-gaap_BusinessAcquisitionAxis
= dar_VionIngredientsMember
 
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest       2,075,006,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedLessNoncontrollingInterest
/ us-gaap_BusinessAcquisitionAxis
= dar_VionIngredientsMember
 
Rothsay [Member]          
Business Acquisition [Line Items]          
Accounts receivable         13,220,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables
/ us-gaap_BusinessAcquisitionAxis
= dar_RothsayMember
Inventory         5,479,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInventory
/ us-gaap_BusinessAcquisitionAxis
= dar_RothsayMember
Other current assets         312,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets
/ us-gaap_BusinessAcquisitionAxis
= dar_RothsayMember
Property and equipment         138,175,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= dar_RothsayMember
Identifiable intangibles         240,386,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= dar_RothsayMember
Goodwill         262,797,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= dar_RothsayMember
Accounts payable         (12,159,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable
/ us-gaap_BusinessAcquisitionAxis
= dar_RothsayMember
Accrued expenses         (5,701,000)dar_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccruedExpenses
/ us-gaap_BusinessAcquisitionAxis
= dar_RothsayMember
Deferred tax liability         (15,031,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent
/ us-gaap_BusinessAcquisitionAxis
= dar_RothsayMember
Capital lease obligation         (10,741,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCapitalLeaseObligation
/ us-gaap_BusinessAcquisitionAxis
= dar_RothsayMember
Other non-current liabilities         (4,102,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther
/ us-gaap_BusinessAcquisitionAxis
= dar_RothsayMember
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net         $ 612,635,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= dar_RothsayMember