Default Event Percent of Principal Held in Order to Declare Notes Due and Payable Immediately

Name:	dar_DefaultEventPercentOfPrincipalHeldInOrderToDeclareNotesDueAndPayableImmediately
Namespace Prefix:	dar
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

LIBOR Margin

+ Details

Name:	dar_LiborMargin
Namespace Prefix:	dar
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

- Definition

Line of Credit Facility Maximum Borrowing Capacity before Increase

+ Details

Name:	dar_LineOfCreditFacilityMaximumBorrowingCapacityBeforeIncrease
Namespace Prefix:	dar
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Margin Interest Rate

+ Details

Name:	dar_MarginInterestRate
Namespace Prefix:	dar
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

- Definition

Percent of Capital Stock of Foreign Subsidiary's Pledged to Secure Credit Agreement Obligation

+ Details

Name:	dar_PercentOfCapitalStockOfForeignSubsidiaryPledgedToSecureCreditAgreementObligation
Namespace Prefix:	dar
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percent of Stock of Material Domestic Subsidiary's Pledged to Secure Credit Agreement Obligation

+ Details

Name:	dar_PercentOfStockOfMaterialDomesticSubsidiarysPledgedToSecureCreditAgreementObligation
Namespace Prefix:	dar
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Redemption Price Of Principal Amount Of Notes Redeemed

+ Details

Name:	dar_RedemptionPriceOfPrincipalAmountOfNotesRedeemed
Namespace Prefix:	dar
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration

- Definition

Revolving Credit Facility Term

+ Details

Name:	dar_RevolvingCreditFacilityTerm
Namespace Prefix:	dar
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Term Loan Facility Term

+ Details

Name:	dar_TermLoanFacilityTerm
Namespace Prefix:	dar
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

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

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate
Namespace Prefix:	us-gaap
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

+ Details

Name:	us-gaap_DebtInstrumentDescriptionOfVariableRateBasis
Namespace Prefix:	us-gaap
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 21
-Paragraph 16, 20
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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=6451184&loc=d3e28551-108399

Reference 3: 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=6584090&loc=d3e28878-108400

+ Details

Name:	us-gaap_DebtInstrumentFaceAmount
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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 22
-Article 5

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=6451184&loc=d3e28551-108399

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(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentInterestRateAtPeriodEnd
Namespace Prefix:	us-gaap
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Interest rate stated in the contractual debt agreement.

+ References

+ Details

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

- Definition

Description of the interest rate as being fixed or variable, and, if variable, identification of the index or rate on which the interest rate is based and the number of points or percentage added to that index or rate to set the rate, and other pertinent information, such as frequency of rate resets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 129
-Paragraph 2, 4
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 22
-Article 5

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(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentInterestRateTerms
Namespace Prefix:	us-gaap
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- 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.

+ Details

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

- Definition

Amount of the required periodic payments including both interest and principal payments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 22
-Article 5

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 210.5-02.22)
-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 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823

+ Details

Name:	us-gaap_DebtInstrumentPeriodicPayment
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	us-gaap_LineOfCreditFacilityAbstract
Namespace Prefix:	us-gaap
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount borrowed under the credit facility as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 19, 22
-Article 5

+ Details

Name:	us-gaap_LineOfCreditFacilityAmountOutstanding
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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 19, 22
-Article 5

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(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 129
-Paragraph 2, 4
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 19, 22
-Article 5

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 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date. May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer, and after deducting unamortized discount or premiums, if any.

+ 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 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 SEC
-Name Regulation S-X (SX)
-Number 210
-Article 7
-Section 03
-Paragraph 16

Reference 4: 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 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 16
-Article 9

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 20, 22
-Article 5

+ Details

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

- Definition

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3291-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 18
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 20
-Subparagraph b
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Financing Activities
-URI http://asc.fasb.org/extlink&oid=6513228

+ Details

Name:	us-gaap_RepaymentsOfLongTermDebt
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 28
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.8)
-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688

+ Details

Name:	us-gaap_WriteOffOfDeferredDebtIssuanceCost
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Debt (Details) (USD $)	6 Months Ended								6 Months Ended			6 Months Ended													6 Months Ended
Debt (Details) (USD $)	Jul. 02, 2011	Jul. 03, 2010	Jul. 02, 2011 Alternate Base Rate [Member] Maximum [Member]	Jul. 02, 2011 Alternate Base Rate [Member] Minimum [Member]	Jul. 02, 2011 Alternate Base Rate [Member] Minimum [Member] Term Loan [Member]	Jul. 02, 2011 Alternate Base Rate [Member] Secured Debt [Member] Revolving Credit Facility	Jul. 02, 2011 LIBOR Rate [Member]	Jul. 02, 2011 LIBOR Rate [Member] Minimum [Member] Secured Debt [Member] Term Loan [Member]	Jul. 02, 2011 Secured Debt [Member] Revolving Credit Facility	Apr. 02, 2011 Secured Debt [Member] Revolving Credit Facility	Jan. 01, 2011 Secured Debt [Member] Revolving Credit Facility	Jul. 02, 2011 Secured Debt [Member] Darling International Senior Unsecured Restricted Notes [Member]	Jul. 02, 2011 Secured Debt [Member] Term Loan [Member]	Jan. 01, 2011 Secured Debt [Member] Term Loan [Member]	Dec. 17, 2010 Secured Debt [Member] Term Loan [Member]	Jul. 02, 2011 Line of Credit [Member] Revolving Credit Facility	Jan. 01, 2011 Line of Credit [Member] Revolving Credit Facility	Jul. 02, 2011 Line of Credit [Member] Darling International Senior Unsecured Exchange Notes [Member]	Jul. 02, 2011 Unsecured [Member] Darling International Senior Unsecured Restricted Notes [Member]	Jan. 01, 2011 Unsecured [Member] Darling International Senior Unsecured Restricted Notes [Member]	Jul. 02, 2011 Unsecured [Member] Darling International Senior Unsecured Exchange Notes [Member]	Jul. 02, 2011 Letter of Credit [Member] Darling International Senior Secured Letter of Credit Sub Facility [Member]	Jan. 01, 2011 Letter of Credit [Member] Darling International Senior Secured Letter of Credit Sub Facility [Member]	Jul. 02, 2011 Bridge Loan [Member] Darling International Senior Secured Swingline Sub Facility [Member]	Jul. 02, 2011 Term Loan [Member]
Debt Instrument [Line Items]
Amount repaid of the original term loan issued	$ 240,005,000	$ 2,504,000											$ 240,000,000
Original amount of term loan											160,000,000		60,000,000	300,000,000	300,000,000	20,000,000	160,000,000		250,000,000	250,000,000
Quarterly amortization payments on term loan									150,000
Write-off of a portion of the senior term loan facilities deferred loan costs									4,200,000
Debt Instrument, Interest Rate at Period End													5.00%
Annual Interest rate on 8.5% Senior Notes due 2018																		8.50%	8.50%
Redemption Price Of Principal Amount Of Notes Redeemed	1
Pledge of stock	100.00%
Pledge of Capital stock	65.00%
Default event, percent of principal held in order to declare notes due and payable immediately	25.00%
Line of Credit Facility [Abstract]
Line of Credit Facility Maximum Borrowing Capacity before Increase										325,000,000
Amended available principal amount									415,000,000		325,000,000											75,000,000		15,000,000
Company availability under revolving loan facility									371,617,000		141,617,000
Outstanding borrowings and letter of credit issued																						23,383,000	23,383,000
Line of Credit Facility Margin Interest Rate						0.0225																			0.025
LIBOR Margin													0.035												0.035
Revolving credit facility term									five-year term
Term Loan Facility Term													six-year term
Debt Instrument Additional Interest Rate Percentage			1.00%	0.50%	2.50%		1.00%	1.50%
Description of Variable Rate									The federal funds effective rate plus 1/2 to 1% and LIBOR for a month interest period plus 1%																Not less than 2.50% per annum, plus the term loan alternate base rate margin of 2.50% and not less than 1.50% per annum, plus the term loan LIBOR margin of 3.50%
Description of interest rate									Base rate plus a margin of 2.25% per annum			LIBOR plus a margin of 3.5% per annum
Interest rate of revolver loan									5.50%
Face amount of debt insturment																			$ 250,000,000		$ 250,000,000