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Stockholders' Equity and Stock-Based Compensation Stockholders' Equity and Stock-Based Compensation (Textuals) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended 0 Months Ended
Jan. 03, 2015
Dec. 28, 2013
Dec. 29, 2012
Dec. 18, 2013
Nov. 26, 2013
Nov. 25, 2013
Class of Stock [Line Items]            
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 1 year 9 months 18 days          
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 $ 416us-gaap_ProceedsFromIssuanceOfCommonStock $ 840,558us-gaap_ProceedsFromIssuanceOfCommonStock $ 72us-gaap_ProceedsFromIssuanceOfCommonStock      
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       $ 840,500us-gaap_ProceedsFromIssuanceOfCommonStock
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
   
Director Restricted Stock Plan [Member]            
Class of Stock [Line Items]            
Share Based Compensation Arrangement By Share Based Payment Award Award Termination Period 10 years          
Omnibus Incentive Plan 2012 [Member]            
Class of Stock [Line Items]            
Share Based Compensation Arrangement By Share Based Payment Award Award Termination Period 10 years          
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
         
Incentive Stock Options [Member]            
Class of Stock [Line Items]            
Stock Issued During Period, Shares, Share-based Compensation, Gross 0us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensationGross
/ us-gaap_AwardTypeAxis
= dar_IncentiveStockOptionsMember
0us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensationGross
/ us-gaap_AwardTypeAxis
= dar_IncentiveStockOptionsMember
0us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensationGross
/ us-gaap_AwardTypeAxis
= dar_IncentiveStockOptionsMember