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Contingencies (Details) (Insurance Environmental and Litigation Matters [Member], USD $)
In Millions, unless otherwise specified
Apr. 04, 2015
Jan. 03, 2015
Insurance Environmental and Litigation Matters [Member]
   
Loss Contingencies [Line Items]    
Reserves for insurance, environmental and litigation contingencies $ 58.1us-gaap_LossContingencyAccrualAtCarryingValue
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= dar_InsuranceEnvironmentalAndLitigationMattersMember
$ 54.9us-gaap_LossContingencyAccrualAtCarryingValue
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= dar_InsuranceEnvironmentalAndLitigationMattersMember
Insurance Settlements Receivable, Noncurrent $ 11.4us-gaap_InsuranceSettlementsReceivableNoncurrent
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= dar_InsuranceEnvironmentalAndLitigationMattersMember
$ 11.4us-gaap_InsuranceSettlementsReceivableNoncurrent
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= dar_InsuranceEnvironmentalAndLitigationMattersMember