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Contingencies (Details) (Insurance Environmental and Litigation Matters [Member], USD $) In Millions, unless otherwise specified | Jan. 03, 2015 | Dec. 28, 2013
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Insurance Environmental and Litigation Matters [Member] |  |
Loss Contingencies [Line Items] |  |
Reserves for insurance, environmental and litigation contingencies | $ 54.9 us-gaap_LossContingencyAccrualAtCarryingValue / us-gaap_LossContingenciesByNatureOfContingencyAxis = dar_InsuranceEnvironmentalAndLitigationMattersMember | $ 35.5 us-gaap_LossContingencyAccrualAtCarryingValue / us-gaap_LossContingenciesByNatureOfContingencyAxis = dar_InsuranceEnvironmentalAndLitigationMattersMember
Insurance Settlements Receivable, Noncurrent | $ 11.4 us-gaap_InsuranceSettlementsReceivableNoncurrent / us-gaap_LossContingenciesByNatureOfContingencyAxis = dar_InsuranceEnvironmentalAndLitigationMattersMember | $ 8.8 us-gaap_InsuranceSettlementsReceivableNoncurrent / us-gaap_LossContingenciesByNatureOfContingencyAxis = dar_InsuranceEnvironmentalAndLitigationMattersMember

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- Definition Carrying amount due after one year of the balance sheet date (or one operating cycle, if longer) of amount due in settlement of a claim for reimbursement from an insurance company when the Company has suffered a loss covered under an insurance policy. + 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 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_InsuranceSettlementsReceivableNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_LossContingenciesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of loss contingency liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 + Details
Name: | us-gaap_LossContingencyAccrualAtCarryingValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant