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Revenue (Details) | Mar. 31, 2018 source
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Revenue from Contract with Customer [Abstract] |
Number of revenue sources | 2

X
- Definition Number of Revenue Sources + References No definition available. + Details
Name: | dar_NumberofRevenueSources
Namespace Prefix: | dar_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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