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Stockholders' Equity and Stock-Based Compensation Stockholders' Equity and Stock-Based Compensation (Nonqualified Stock Options) (Details) (USD $)
0 Months Ended 12 Months Ended 0 Months Ended
Mar. 04, 2014
Jan. 03, 2015
Dec. 28, 2013
Dec. 29, 2012
Dec. 18, 2013
Mar. 05, 2013
Mar. 06, 2012
Nov. 26, 2013
Nov. 25, 2013
Class of Stock [Line Items]                  
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized   $ 15,900,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized              
Common stock, par value   $ 0.01us-gaap_CommonStockParOrStatedValuePerShare $ 0.01us-gaap_CommonStockParOrStatedValuePerShare $ 0.01us-gaap_CommonStockParOrStatedValuePerShare          
Common stock, shares authorized   250,000,000us-gaap_CommonStockSharesAuthorized 250,000,000us-gaap_CommonStockSharesAuthorized         250,000,000us-gaap_CommonStockSharesAuthorized 150,000,000us-gaap_CommonStockSharesAuthorized
Issuance of common stock   416,000us-gaap_ProceedsFromIssuanceOfCommonStock 840,558,000us-gaap_ProceedsFromIssuanceOfCommonStock 72,000us-gaap_ProceedsFromIssuanceOfCommonStock          
Granted (in shares)   163,078us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross              
Granted, Weighted-average exercise price per share $ 19.94us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice                
Proceeds from Stock Options Exercised   400,000us-gaap_ProceedsFromStockOptionsExercised   100,000us-gaap_ProceedsFromStockOptionsExercised          
Tax Benefit from Stock Options Exercised   2,400,000us-gaap_DeferredTaxExpenseFromStockOptionsExercised 700,000us-gaap_DeferredTaxExpenseFromStockOptionsExercised 2,700,000us-gaap_DeferredTaxExpenseFromStockOptionsExercised          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value   4,500,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue 200,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue 3,300,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value   19,600,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue 8,200,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue 8,100,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value   3,300,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value   3,100,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1              
Common Stock [Member]                  
Class of Stock [Line Items]                  
Issuance of common stock (in shares)         46,000,000us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
       
Price of common stock in public offering         $ 19.0dar_PriceOfCommonStockInPublicOffering
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
       
Issuance of common stock         $ 840,500,000us-gaap_ProceedsFromIssuanceOfCommonStock
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
       
Omnibus Incentive Plan 2012 [Member]                  
Class of Stock [Line Items]                  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized   11,066,544us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= dar_OmnibusIncentivePlan2012Member
             
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant   8,829,322us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= dar_OmnibusIncentivePlan2012Member
             
Nonqualified Stock Options Under Long Term Incentive Program [Member]                  
Class of Stock [Line Items]                  
Granted (in shares) 163,078us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= dar_NonqualifiedStockOptionsUnderLongTermIncentiveProgramMember
        195,634us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= dar_NonqualifiedStockOptionsUnderLongTermIncentiveProgramMember
135,733us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= dar_NonqualifiedStockOptionsUnderLongTermIncentiveProgramMember
   
Granted, Weighted-average exercise price per share $ 19.94us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= dar_NonqualifiedStockOptionsUnderLongTermIncentiveProgramMember
        $ 16.53us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= dar_NonqualifiedStockOptionsUnderLongTermIncentiveProgramMember
$ 16.98us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= dar_NonqualifiedStockOptionsUnderLongTermIncentiveProgramMember
   
Share-based Compensation Arrangement by Share-based Payment Award, Initial Cliff, Percent   25.00%dar_ShareBasedCompensationArrangementByShareBasedPaymentAwardInitialCliffPercent
/ us-gaap_AwardTypeAxis
= dar_NonqualifiedStockOptionsUnderLongTermIncentiveProgramMember
             
Share-based Compensation Arrangement by Share-based Payment Award, Annual Vesting After Initial Cliff   25.00%dar_ShareBasedCompensationArrangementByShareBasedPaymentAwardAnnualVestingAfterInitialCliff
/ us-gaap_AwardTypeAxis
= dar_NonqualifiedStockOptionsUnderLongTermIncentiveProgramMember