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Business Segments (Narrative) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended |
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Jan. 03, 2015 segment | Sep. 27, 2014 | Jun. 28, 2014 | Mar. 29, 2014 | Dec. 28, 2013 | Sep. 28, 2013 | Jun. 29, 2013 | Mar. 30, 2013 | Jan. 03, 2015 segment | Dec. 28, 2013 | Dec. 29, 2012 | Dec. 29, 2013 segment
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Business Segments | 3 dar_NumberOfBusinessSegments |  |  |  |  |  |  |  | 3 dar_NumberOfBusinessSegments |  |  |  |  |  | 3 dar_NumberOfBusinessSegments
Net Sales | $ 1,000,203 us-gaap_SalesRevenueNet | $ 978,665 us-gaap_SalesRevenueNet | $ 1,031,283 us-gaap_SalesRevenueNet | $ 946,292 us-gaap_SalesRevenueNet | $ 447,939 us-gaap_SalesRevenueNet | $ 445,130 us-gaap_SalesRevenueNet | $ 443,542 us-gaap_SalesRevenueNet | $ 465,657 us-gaap_SalesRevenueNet | $ 3,956,443 us-gaap_SalesRevenueNet |  | $ 1,802,268 us-gaap_SalesRevenueNet |  | $ 1,772,552 us-gaap_SalesRevenueNet |  |
Capital expenditures |  |  |  |  |  |  |  |  | 228,918 us-gaap_PaymentsToAcquireProductiveAssets | [1] | 118,307 us-gaap_PaymentsToAcquireProductiveAssets | [1] | 115,413 us-gaap_PaymentsToAcquireProductiveAssets | [1] |
Vion Ingredients [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  |  | 984,200 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_BusinessAcquisitionAxis = dar_VIONandCustomerBlendersAcquisitionMember |  |  |  |  |  |
Terra Transaction and Rothsay Acquisition [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  |  | 167,000 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_BusinessAcquisitionAxis = dar_TerraTransactionandRothsayAcquisitionMember |  |  |  |  |  |
BioPur Transaction [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  |  |  |  | $ 600 us-gaap_PaymentsToAcquireProductiveAssets / us-gaap_BusinessAcquisitionAxis = dar_BiopurTransactionMember |  |  |  |
[1] | Excludes the capital assets acquired as part of the acquisition of assets related to VION Acquisition and Custom Blenders acquisition in fiscal 2014 of approximately $984.2 million, the Terra Transaction and the Rothsay Acquisition in fiscal 2013 of approximately $167.0 million and the BioPur acquisition in fiscal 2012 of approximately $0.6 million

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- Definition The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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