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Business Segments (Narrative) (Details) | Jun. 30, 2018 segment
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Segment Reporting [Abstract] |
Number of Business Segments | 3

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- Definition Number of Business Segments + References No definition available. + Details
Name: | dar_NumberOfBusinessSegments
Namespace Prefix: | dar_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_SegmentReportingAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration