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Guarantor Financial Information (Narrative) (Details) | Mar. 31, 2018
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Guarantor Financial Information [Abstract] |
Company's percentage of directly and indirectly owned subsidiaries | 100.00%

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- Definition Guarantor Financial Information [Abstract] + References No definition available. + Details
Name: | dar_GuarantorFinancialInformationAbstract
Namespace Prefix: | dar_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The parent entity's interest in net assets of the subsidiary, expressed as a percentage. + References No definition available. + Details
Name: | us-gaap_MinorityInterestOwnershipPercentageByParent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant