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Accounting Policies (Detail) - Schedule of components of inventory (USD $)
In Thousands, unless otherwise specified
Oct. 31, 2012
Jan. 31, 2012
Ethanol and other finished goods $ 7,268 $ 5,318
Work in process 4,576 3,819
Grain and other raw materials 16,460 21,212
Total $ 28,304 $ 30,349