Amount of capital lease obligation due within one year or the normal operating cycle, if longer.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=84164817&loc=d3e45280-112737

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(19))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=84164758&loc=d3e45023-112735

+ Details

Name:	us-gaap_CapitalLeaseObligationsCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal, through the balance sheet date and due to be paid more than one year (or one operating cycle, if longer) after the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=84164817&loc=d3e45280-112737

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=84164758&loc=d3e45023-112735

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_CapitalLeaseObligationsNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.13,16)
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.16)
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

+ Details

Name:	us-gaap_DebtAndCapitalLeaseObligations
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

+ Details

Name:	us-gaap_DebtInstrumentCarryingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

+ Details

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

+ Details

Name:	us-gaap_DebtInstrumentInterestRateEffectivePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

+ Details

Name:	us-gaap_LineOfCredit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The effective interest rate at the end of the reporting period.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_LongTermDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of long-term debt and capital lease obligation due after one year or beyond the normal operating cycle, if longer.

+ References

+ Details

Name:	us-gaap_LongTermDebtAndCapitalLeaseObligations
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of long-term debt and capital leases due within one year or the normal operating cycle, if longer.

+ References

+ Details

Name:	us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

+ References

+ Details

Name:	us-gaap_UnamortizedDebtIssuanceExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	us-gaap_LongtermDebtTypeAxis=dar_TermLoanAFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=dar_SeniorSecuredFacilitiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=dar_TermLoanBFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_SeniorNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=dar_SeniorNotes5.375Due2022Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=dar_SeniorNotes4.75Due2022Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_NotesPayableOtherPayablesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_LetterOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_LineOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=dar_TermLoanAFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=dar_TermLoanBFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CurrencyAxis=currency_CAD
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CurrencyAxis=currency_EUR
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CurrencyAxis=currency_USD
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=dar_CanadianDealerOfferedRateCDORMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_SecuredDebtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_BaseRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Debt (Schedule of Long-term Debt) (Details) $ in Millions	3 Months Ended
Debt (Schedule of Long-term Debt) (Details) $ in Millions	Mar. 31, 2018 USD ($)	Mar. 31, 2018 CAD ($)	Mar. 31, 2018 EUR (€)	Dec. 30, 2017 USD ($)	Jun. 03, 2015 EUR (€)	Jan. 02, 2014 USD ($)
Debt Instrument [Line Items]
Debt and Capital Lease Obligations	$ 1,781,145,000			$ 1,714,193,000
Current portion of long-term debt	16,722,000			16,143,000
Long-term debt, net of current portion	1,764,423,000			1,698,050,000
Capital lease obligations, current		$ 0.7	€ 100,000
Capital lease obligations, noncurrent		$ 0.4	€ 100,000
Term Loan A Facility [Member] \| Senior Secured Facilities [Member]
Debt Instrument [Line Items]
Long-term Debt	94,301,000			95,694,000
Long-term Debt, Gross	94,924,000			96,365,000
Unamortized Debt Issuance Expense	(623,000)			(671,000)
Term Loan B Facility [Member] \| Senior Secured Facilities [Member]
Debt Instrument [Line Items]
Long-term Debt	494,762,000			494,422,000
Long-term Debt, Gross	505,000,000			505,000,000
Unamortized Debt Issuance Expense	(10,238,000)			(10,578,000)
Senior Notes [Member] \| Senior Notes 5.375% Due 2022 [Member]
Debt Instrument [Line Items]
Long-term Debt	494,043,000			493,362,000
Long-term Debt, Gross	500,000,000			500,000,000
Unamortized Debt Issuance Expense	$ (5,957,000)			$ (6,638,000)
Stated interest rate						5.375%
Debt instrument, interest rate, effective percentage	5.72%	5.72%	5.72%	5.72%
Face amount of debt instrument						$ 500,000,000
Senior Notes [Member] \| Senior Notes 4.75% Due 2022 [Member]
Debt Instrument [Line Items]
Long-term Debt	$ 626,389,000			$ 608,681,000
Long-term Debt, Gross	634,918,000			617,356,000
Unamortized Debt Issuance Expense	$ (8,529,000)			$ (8,675,000)
Line of credit outstanding \| €			€ 515,000,000
Stated interest rate					4.75%
Debt instrument, interest rate, effective percentage	5.10%	5.10%	5.10%	5.10%
Face amount of debt instrument \| €					€ 515,000,000.0
Notes Payable, Other Payables [Member]
Debt Instrument [Line Items]
Long-term Debt	$ 16,276,000			$ 22,034,000
Letter of Credit [Member] \| Senior Secured Facilities [Member]
Debt Instrument [Line Items]
Line of credit outstanding	22,900,000
Revolving Credit Facility [Member] \| Line of Credit [Member] \| Senior Secured Facilities [Member]
Debt Instrument [Line Items]
Long-term Debt	55,374,000			0
Term Loan A Facility [Member] \| Senior Secured Facilities [Member]
Debt Instrument [Line Items]
Face amount of debt instrument	350,000,000
Term Loan B Facility [Member] \| Senior Secured Facilities [Member]
Debt Instrument [Line Items]
Face amount of debt instrument	525,000,000.0
Canada, Dollars \| Revolving Credit Facility [Member] \| Senior Secured Facilities [Member]
Debt Instrument [Line Items]
Line of credit outstanding		$ 5.0
Canada, Dollars \| Revolving Credit Facility [Member] \| Line of Credit [Member] \| Senior Secured Facilities [Member]
Debt Instrument [Line Items]
Long-term Debt	3,900,000			0
Canada, Dollars \| Term Loan A Facility [Member] \| Senior Secured Facilities [Member]
Debt Instrument [Line Items]
Line of credit outstanding	51,700,000	$ 66.6		53,100,000
Euro Member Countries, Euro \| Revolving Credit Facility [Member] \| Senior Secured Facilities [Member]
Debt Instrument [Line Items]
Line of credit outstanding \| €			€ 15,000,000
Euro Member Countries, Euro \| Revolving Credit Facility [Member] \| Line of Credit [Member] \| Senior Secured Facilities [Member]
Debt Instrument [Line Items]
Long-term Debt	18,500,000			$ 0
U.S. dollar \| Term Loan A Facility [Member] \| Senior Secured Facilities [Member]
Debt Instrument [Line Items]
Line of credit outstanding	43,300,000
U.S. dollar \| Term Loan B Facility [Member] \| Senior Secured Facilities [Member]
Debt Instrument [Line Items]
Line of credit outstanding	$ 500,000,000
Canadian Dealer Offered Rate (CDOR) [Member] \| Canada, Dollars
Debt Instrument [Line Items]
Interest rate	3.7047%	3.7047%	3.7047%
Canadian Dealer Offered Rate (CDOR) [Member] \| Canada, Dollars \| Secured Debt [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	2.00%
Canadian Dealer Offered Rate (CDOR) [Member] \| Canada, Dollars \| Revolving Credit Facility [Member] \| Senior Secured Facilities [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	2.00%
Interest rate	3.6691%	3.6691%	3.6691%
London Interbank Offered Rate (LIBOR) [Member] \| Secured Debt [Member] \| Senior Secured Facilities [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	2.00%
Interest rate	3.88%	3.88%	3.88%
London Interbank Offered Rate (LIBOR) [Member] \| Term Loan B Facility [Member] \| Senior Secured Facilities [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	2.00%
Interest rate	3.88%	3.88%	3.88%
London Interbank Offered Rate (LIBOR) [Member] \| Euro Member Countries, Euro \| Revolving Credit Facility [Member] \| Senior Secured Facilities [Member]
Debt Instrument [Line Items]
Line of credit outstanding \| €			€ 15,000,000
London Interbank Offered Rate (LIBOR) [Member] \| U.S. dollar \| Revolving Credit Facility [Member] \| Senior Secured Facilities [Member]
Debt Instrument [Line Items]
Line of credit outstanding	$ 10,000,000
Base Rate [Member] \| Secured Debt [Member] \| Senior Secured Facilities [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	1.00%
Interest rate	5.75%	5.75%	5.75%
Base Rate [Member] \| Term Loan B Facility [Member] \| Senior Secured Facilities [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	1.00%
Interest rate	5.75%	5.75%	5.75%
Base Rate [Member] \| U.S. dollar \| Revolving Credit Facility [Member] \| Senior Secured Facilities [Member]
Debt Instrument [Line Items]
Line of credit outstanding	$ 23,000,000
Base Rate [Member] \| U.S. dollar \| Term Loan B Facility [Member] \| Senior Secured Facilities [Member]
Debt Instrument [Line Items]
Line of credit outstanding	$ 5,000,000