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Concentration of Credit Risk (Details) (Customer Concentration Risk [Member]) | 12 Months Ended
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Jan. 03, 2015 customer | Dec. 28, 2013 customer | Dec. 29, 2012 customer
Concentration Risk [Line Items] |  |  |
Number Of Customers Accounted For More Than 10 Percent Of Entity's Net Sales | 0 dar_NumberOfCustomersAccountedForMoreThan10PercentOfEntitysNetSales | 0 dar_NumberOfCustomersAccountedForMoreThan10PercentOfEntitysNetSales | 0 dar_NumberOfCustomersAccountedForMoreThan10PercentOfEntitysNetSales
Maximum [Member] |  |  |
Concentration Risk [Line Items] |  |  |
Concentration Risk, Percentage | 10.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |

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- Definition Number Of Customers Accounted For More Than 10 Percent Of Entity's Net Sales + References No definition available. + Details
Name: | dar_NumberOfCustomersAccountedForMoreThan10PercentOfEntitysNetSales
Namespace Prefix: | dar_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_ConcentrationRiskLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13537-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13531-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592 + Details
Name: | us-gaap_ConcentrationRiskPercentage1
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |