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DISCONTINUED OPERATIONS (Detail) (USD $)	12 Months Ended
	Jan. 31, 2011	Jan. 31, 2013	Jan. 31, 2012
Impairment Charges and Loss on Deconsolidation	$ 18,424,000
Equity Method Investments		59,959,000	61,679,000
Levelland Hockley County Ethanol LLC [Member]
Impairment Charges and Loss on Deconsolidation	18,400,000
Equity Method Investments	$ 0

X

- Definition

The charge against earnings resulting from the aggregate write down of all assets from their carrying value to their fair value and the amount of the loss recognized on deconsolidation.

+ References

No definition available.

+ Details

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X

- Definition

This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.12)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=16385135&loc=d3e33749-111570

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