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Accounting Policies (Detail) - Schedule of components of inventory (USD $)
In Thousands, unless otherwise specified
Apr. 30, 2013
Jan. 31, 2013
Ethanol and other finished goods $ 7,468 $ 7,306
Work in process 4,744 4,414
Grain and other raw materials 8,973 13,199
Total $ 21,185 $ 24,919