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Fair Value of Financial Instruments - Assets and Liabilities Measured at Fair Value on Non-Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified | Apr. 30, 2013 | Apr. 30, 2012
--- | --- | ---
Assets: |  |
Investment in unconsolidated entity - GreenFiber | $ 20,252 | $ 22,781
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] |  |
Assets: |  |
Asset group held-for-sale - Bio Fuels |  |
Investment in unconsolidated entity - GreenFiber |  |
Long lived asset group |  |
Liabilities: |  |
Guaranty |  |
Significant Other Observable Inputs (Level 2) [Member] |  |
Assets: |  |
Asset group held-for-sale - Bio Fuels |  |
Investment in unconsolidated entity - GreenFiber |  |
Long lived asset group |  |
Liabilities: |  |
Guaranty |  |
Significant Unobservable Inputs (Level 3) [Member] |  |
Assets: |  |
Asset group held-for-sale - Bio Fuels | 61 |
Investment in unconsolidated entity - GreenFiber |  | 6,502
Long lived asset group |  | 1,551
Liabilities: |  |
Guaranty | $ 2,073 | $ 264

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- Definition This item represents a non-contingent liability for the fair value of an obligation to stand ready to perform over the term of a guaranty issued in the event that specified triggering events or conditions occur. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 25 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=7661617&loc=d3e11019-110243 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 45 -Paragraph 5, 9 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.15) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 45 -Paragraph 3 -Subparagraph b, d -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.15) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 25 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=7661617&loc=d3e11049-110243 + Details
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