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Related Party Transactions (Details) (USD $)
12 Months Ended
Jan. 03, 2015
Dec. 28, 2013
Dec. 29, 2012
Diamond Green Diesel Holdings LLC Joint Venture [Member]      
Related Party Transaction [Line Items]      
Revenue from Related Parties $ 159,800,000us-gaap_RevenueFromRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= dar_DiamondGreenDieselHoldingsLlcJointVentureMember
$ 83,800,000us-gaap_RevenueFromRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= dar_DiamondGreenDieselHoldingsLlcJointVentureMember
$ 300,000us-gaap_RevenueFromRelatedParties
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= dar_DiamondGreenDieselHoldingsLlcJointVentureMember
Accounts Receivable, Related Parties, Current 6,100,000us-gaap_AccountsReceivableRelatedPartiesCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= dar_DiamondGreenDieselHoldingsLlcJointVentureMember
14,600,000us-gaap_AccountsReceivableRelatedPartiesCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= dar_DiamondGreenDieselHoldingsLlcJointVentureMember
 
Related Party, Sales Eliminated 5,100,000dar_RelatedPartySalesEliminated
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= dar_DiamondGreenDieselHoldingsLlcJointVentureMember
3,700,000dar_RelatedPartySalesEliminated
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= dar_DiamondGreenDieselHoldingsLlcJointVentureMember
 
Deferred Revenue, Additions 1,300,000us-gaap_DeferredRevenueAdditions
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= dar_DiamondGreenDieselHoldingsLlcJointVentureMember
600,000us-gaap_DeferredRevenueAdditions
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= dar_DiamondGreenDieselHoldingsLlcJointVentureMember
 
Jackson Property [Member]      
Related Party Transaction [Line Items]      
Operating Leases, Rent Expense, Minimum Rentals 221,715us-gaap_OperatingLeasesRentExpenseMinimumRentals
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= dar_JacksonPropertyMember
   
Lease term, Renewal Option, Number Of Additional Terms 2dar_LeaseTermRenewalOptionNumberOfAdditionalTerms
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= dar_JacksonPropertyMember
   
Lease term, Renewal Option, Additional Term 10 years    
Lease Term 30 years    
Henderson Property [Member]      
Related Party Transaction [Line Items]      
Operating Leases, Rent Expense, Minimum Rentals 60,000us-gaap_OperatingLeasesRentExpenseMinimumRentals
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= dar_HendersonPropertyMember
   
Lease term, Renewal Option, Number Of Additional Terms 4dar_LeaseTermRenewalOptionNumberOfAdditionalTerms
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= dar_HendersonPropertyMember
   
Lease term, Renewal Option, Additional Term 5 years    
Lease Term 10 years    
Butler Properties [Member]      
Related Party Transaction [Line Items]      
Operating Leases, Rent Expense, Minimum Rentals $ 30,000us-gaap_OperatingLeasesRentExpenseMinimumRentals
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= dar_ButlerPropertiesMember
   
Number Of Properties Leased 2dar_NumberOfPropertiesLeased
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= dar_ButlerPropertiesMember
   
Lease term, Renewal Option, Number Of Additional Terms 2dar_LeaseTermRenewalOptionNumberOfAdditionalTerms
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= dar_ButlerPropertiesMember
   
Lease term, Renewal Option, Additional Term 10 years    
Lease Term 30 years    
Lease Term Of Initial Rental Payment [Member] | Jackson Property [Member]      
Related Party Transaction [Line Items]      
Lease Term 5 years    
Lease Term Of Initial Rental Payment [Member] | Henderson Property [Member]      
Related Party Transaction [Line Items]      
Lease Term 5 years    
Lease Term Of Initial Rental Payment [Member] | Butler Properties [Member]      
Related Party Transaction [Line Items]      
Lease Term 5 years    
Lease Term Of Increased Rental Payment [Member] | Jackson Property [Member]      
Related Party Transaction [Line Items]      
Lease Term 5 years    
Lease Term Of Increased Rental Payment [Member] | Henderson Property [Member]      
Related Party Transaction [Line Items]      
Lease Term 5 years    
Lease Term Of Increased Rental Payment [Member] | Butler Properties [Member]      
Related Party Transaction [Line Items]      
Lease Term 5 years