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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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Assets held for sale, fair value disclosure.

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No definition available.

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- Definition

The carrying amount on the books of the entity of the impaired asset to be disposed of by sale.

+ References

No definition available.

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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

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.



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Total investments in (A) an entity in which the entity has significant influence, but does not have control, (B) subsidiaries that are not required to be consolidated and are accounted for using the equity and or cost method, and (C) an entity in which the reporting entity shares control of the entity with another party or group. Includes long-term advances receivable from a party that is affiliated with the reporting entity by means of direct or indirect ownership.

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