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Revenue (Details)	Jun. 30, 2018 source
Revenue from Contract with Customer [Abstract]
Number of revenue sources	2

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- Definition

Number of Revenue Sources

+ References

No definition available.

+ Details

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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_RevenueFromContractWithCustomerAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration