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Net Sales and Revenue (Details) - Schedule of Net Sales and Revenue for Each Product and Service Group - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2016	Apr. 30, 2015
Revenue from External Customer [Line Items]
Product or Service	$ 100,222	$ 105,197
Ethanol [Member]
Revenue from External Customer [Line Items]
Product or Service	77,631	78,572
Dried distillers grains [Member]
Revenue from External Customer [Line Items]
Product or Service	17,054	20,251
Non-food grade corn oil [Member]
Revenue from External Customer [Line Items]
Product or Service	3,846	3,959
Modified distillers grains [Member]
Revenue from External Customer [Line Items]
Product or Service	1,564	2,305
Other [Member]
Revenue from External Customer [Line Items]
Product or Service	$ 127	$ 110

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Definition

Revenue earned during the period from alternative energy sources (for example, ethanol, biomass, solar, geothermal, and wind power).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 235
-Section 50
-Paragraph 24
-URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e62246-109447

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 235
-Section 50
-Paragraph 23
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e62136-109447

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