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Business Segments (Narrative) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 28, 2013 segment | Sep. 29, 2012 | Sep. 28, 2013 segment | Sep. 29, 2012
Segment Reporting Information [Line Items] |  |  |  |
Number of Business Segments | 2 |  | 2 |
Net sales | $ 425,786 | $ 452,732 | $ 1,294,801 | $ 1,276,514
Rendering [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 362,077 | 368,154 | 1,079,848 | 1,061,947
Fat [Member] | Rendering [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | 195,400 | 205,900 | 580,900 | 626,000
Protein [Member] | Rendering [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net sales | $ 133,600 | $ 137,100 | $ 410,600 | $ 361,900

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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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