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Debt (Schedule of Long-term Debt) (Details)
Apr. 04, 2015
USD ($)
Apr. 04, 2015
CAD
Apr. 04, 2015
EUR (€)
Jan. 03, 2015
USD ($)
Apr. 04, 2015
Term Loan A Facility [Member]
Senior Secured Facilities [Member]
USD ($)
Jan. 03, 2015
Term Loan A Facility [Member]
Senior Secured Facilities [Member]
USD ($)
Apr. 04, 2015
Term Loan B Facility [Member]
Senior Secured Facilities [Member]
USD ($)
Jan. 03, 2015
Term Loan B Facility [Member]
Senior Secured Facilities [Member]
USD ($)
Apr. 04, 2015
Senior Notes [Member]
Senior Notes 5.375% Due 2022 [Member]
USD ($)
Jan. 03, 2015
Senior Notes [Member]
Senior Notes 5.375% Due 2022 [Member]
USD ($)
Apr. 04, 2015
Notes Payable, Other Payables [Member]
USD ($)
Jan. 03, 2015
Notes Payable, Other Payables [Member]
USD ($)
Apr. 04, 2015
Revolving Credit Facility [Member]
Line of Credit [Member]
Senior Secured Facilities [Member]
USD ($)
Jan. 03, 2015
Revolving Credit Facility [Member]
Line of Credit [Member]
Senior Secured Facilities [Member]
USD ($)
Apr. 04, 2015
Term Loan B Facility [Member]
Senior Secured Facilities [Member]
USD ($)
Apr. 04, 2015
Term Loan A Facility [Member]
Senior Secured Facilities [Member]
USD ($)
Apr. 04, 2015
Canada, Dollars
Term Loan A Facility [Member]
Senior Secured Facilities [Member]
USD ($)
Apr. 04, 2015
Canada, Dollars
Term Loan A Facility [Member]
Senior Secured Facilities [Member]
CAD
Jan. 03, 2015
Canada, Dollars
Term Loan A Facility [Member]
Senior Secured Facilities [Member]
USD ($)
Apr. 04, 2015
Euro Member Countries, Euro
Term Loan B Facility [Member]
Senior Secured Facilities [Member]
USD ($)
Apr. 04, 2015
Euro Member Countries, Euro
Term Loan B Facility [Member]
Senior Secured Facilities [Member]
EUR (€)
Jan. 03, 2015
Euro Member Countries, Euro
Term Loan B Facility [Member]
Senior Secured Facilities [Member]
USD ($)
Apr. 04, 2015
Canadian Dealer Offered Rate (CDOR) [Member]
Canada, Dollars
Revolving Credit Facility [Member]
Senior Secured Facilities [Member]
USD ($)
Apr. 04, 2015
Canadian Dealer Offered Rate (CDOR) [Member]
Canada, Dollars
Revolving Credit Facility [Member]
Senior Secured Facilities [Member]
CAD
Jan. 03, 2015
Canadian Dealer Offered Rate (CDOR) [Member]
Canada, Dollars
Revolving Credit Facility [Member]
Senior Secured Facilities [Member]
USD ($)
Apr. 04, 2015
London Interbank Offered Rate (LIBOR) [Member]
Revolving Credit Facility [Member]
Senior Secured Facilities [Member]
USD ($)
Apr. 04, 2015
London Interbank Offered Rate (LIBOR) [Member]
Euro Member Countries, Euro
Revolving Credit Facility [Member]
Senior Secured Facilities [Member]
USD ($)
Apr. 04, 2015
London Interbank Offered Rate (LIBOR) [Member]
Euro Member Countries, Euro
Revolving Credit Facility [Member]
Senior Secured Facilities [Member]
EUR (€)
Debt Instrument [Line Items]                                                        
Line of credit outstanding                             $ 1,300,000,000us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= dar_TermLoanBFacilityMember
/ us-gaap_DebtInstrumentAxis
= dar_SeniorSecuredFacilitiesMember
$ 350,000,000us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= dar_TermLoanAFacilityMember
/ us-gaap_DebtInstrumentAxis
= dar_SeniorSecuredFacilitiesMember
$ 112,200,000us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= dar_TermLoanAFacilityMember
/ us-gaap_CurrencyAxis
= currency_CAD
/ us-gaap_DebtInstrumentAxis
= dar_SeniorSecuredFacilitiesMember
140,600,000us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= dar_TermLoanAFacilityMember
/ us-gaap_CurrencyAxis
= currency_CAD
/ us-gaap_DebtInstrumentAxis
= dar_SeniorSecuredFacilitiesMember
$ 122,200,000us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= dar_TermLoanAFacilityMember
/ us-gaap_CurrencyAxis
= currency_CAD
/ us-gaap_DebtInstrumentAxis
= dar_SeniorSecuredFacilitiesMember
$ 551,100,000us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= dar_TermLoanBFacilityMember
/ us-gaap_CurrencyAxis
= currency_EUR
/ us-gaap_DebtInstrumentAxis
= dar_SeniorSecuredFacilitiesMember
€ 504,900,000us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= dar_TermLoanBFacilityMember
/ us-gaap_CurrencyAxis
= currency_EUR
/ us-gaap_DebtInstrumentAxis
= dar_SeniorSecuredFacilitiesMember
$ 610,200,000us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= dar_TermLoanBFacilityMember
/ us-gaap_CurrencyAxis
= currency_EUR
/ us-gaap_DebtInstrumentAxis
= dar_SeniorSecuredFacilitiesMember
$ 32,700,000us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_CurrencyAxis
= currency_CAD
/ us-gaap_DebtInstrumentAxis
= dar_SeniorSecuredFacilitiesMember
/ us-gaap_VariableRateAxis
= dar_CanadianDealerOfferedRateCDORMember
41,000,000us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_CurrencyAxis
= currency_CAD
/ us-gaap_DebtInstrumentAxis
= dar_SeniorSecuredFacilitiesMember
/ us-gaap_VariableRateAxis
= dar_CanadianDealerOfferedRateCDORMember
$ 36,900,000us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_CurrencyAxis
= currency_CAD
/ us-gaap_DebtInstrumentAxis
= dar_SeniorSecuredFacilitiesMember
/ us-gaap_VariableRateAxis
= dar_CanadianDealerOfferedRateCDORMember
$ 45,000,000us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= dar_SeniorSecuredFacilitiesMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
$ 10,900,000us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_CurrencyAxis
= currency_EUR
/ us-gaap_DebtInstrumentAxis
= dar_SeniorSecuredFacilitiesMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
€ 10,000,000us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_CurrencyAxis
= currency_EUR
/ us-gaap_DebtInstrumentAxis
= dar_SeniorSecuredFacilitiesMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
Long-term Debt 2,090,730,000us-gaap_LongTermDebt     2,152,440,000us-gaap_LongTermDebt 299,620,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= dar_SeniorSecuredFacilitiesMember
/ us-gaap_LongtermDebtTypeAxis
= dar_TermLoanAFacilityMember
312,161,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= dar_SeniorSecuredFacilitiesMember
/ us-gaap_LongtermDebtTypeAxis
= dar_TermLoanAFacilityMember
1,145,098,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= dar_SeniorSecuredFacilitiesMember
/ us-gaap_LongtermDebtTypeAxis
= dar_TermLoanBFacilityMember
1,205,669,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= dar_SeniorSecuredFacilitiesMember
/ us-gaap_LongtermDebtTypeAxis
= dar_TermLoanBFacilityMember
500,000,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= dar_SeniorNotes5.375Due2022Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
500,000,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= dar_SeniorNotes5.375Due2022Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
57,408,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_NotesPayableOtherPayablesMember
32,747,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_NotesPayableOtherPayablesMember
88,604,000us-gaap_LongTermDebt
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= dar_SeniorSecuredFacilitiesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
101,863,000us-gaap_LongTermDebt
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= dar_SeniorSecuredFacilitiesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
                           
Current portion of long-term debt 81,195,000us-gaap_LongTermDebtCurrent     54,401,000us-gaap_LongTermDebtCurrent                                                
Long-term debt, net of current portion 2,009,535,000us-gaap_LongTermDebtNoncurrent     2,098,039,000us-gaap_LongTermDebtNoncurrent                                                
Capital Lease Obligations, Current   2,400,000us-gaap_CapitalLeaseObligationsCurrent 300,000us-gaap_CapitalLeaseObligationsCurrent                                                  
Capital Lease Obligations, Noncurrent   4,300,000us-gaap_CapitalLeaseObligationsNoncurrent € 900,000us-gaap_CapitalLeaseObligationsNoncurrent