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Derivatives and Fair Value of Financial Instruments (Details 3) (USD $) | Mar. 31, 2012 agreement | Dec. 31, 2011 agreement | Aug. 28, 2010 Y | May 29, 2010 Y agreement
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Net commodity purchase contracts | Soybean oil |  |  |  |
Derivative commodity instruments |  |  |  |
Nonmonetary notional amount |  | 2,580,000 |  |
Net commodity purchase contracts | Soybean meal |  |  |  |
Derivative commodity instruments |  |  |  |
Nonmonetary notional amount |  | 23,300 |  |
Net commodity purchase contracts | Hogs |  |  |  |
Derivative commodity instruments |  |  |  |
Nonmonetary notional amount | 7,160,000 | 2,280,000 |  |
Net commodity purchase contracts | Sugar |  |  |  |
Derivative commodity instruments |  |  |  |
Nonmonetary notional amount | 1,213,000 |  |  |
Net commodity sale contracts | Grain |  |  |  |
Derivative commodity instruments |  |  |  |
Nonmonetary notional amount | 595,000 | 10,599,000 |  |
Net commodity sale contracts | Soybean meal |  |  |  |
Derivative commodity instruments |  |  |  |
Nonmonetary notional amount | 114,000 |  |  |
Net commodity sale contracts | Heating oil |  |  |  |
Derivative commodity instruments |  |  |  |
Nonmonetary notional amount | 714,000 | 1,176,000 |  |
Foreign currency exchange agreements |  |  |  |
Derivative commodity instruments |  |  |  |
Aggregate notional amount | $ 127,029,000 | $ 158,266,000 |  |
Interest rate exchange agreements |  |  |  |
Derivative commodity instruments |  |  |  |
Aggregate notional amount | 100,000,000 | 100,000,000 |  |
Notional amounts |  |  | $ 25,000,000 | $ 25,000,000
Number of derivative agreements entered | 4 | 4 |  | 3
Term of derivative contract (in years) |  |  | 10 | 10

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- Definition Aggregate notional amount of derivative expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 + Details
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- Definition Monetary amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 + Details
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- Definition Represents the term of the derivative contract entered into by the entity. + References No definition available. + Details
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- Details
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- Definition The number of derivative instruments of a particular group held by the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5579245-113959 + Details
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- Definition Aggregate notional amount of all derivatives. The notional amount relates to a number of currency units, shares, bushels, pounds, or other units specified in a derivative instrument. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Notional Amount -URI http://asc.fasb.org/extlink&oid=6519104 + Details
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