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Net Sales and Revenue (Details) - Schedule of Net Sales and Revenue for Each Product and Service Group (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Apr. 30, 2015	Apr. 30, 2014
Revenue from External Customer [Line Items]
Product or Service	$ 105,197us-gaap_OtherAlternativeEnergySalesRevenue	$ 155,924us-gaap_OtherAlternativeEnergySalesRevenue
Ethanol [Member]
Revenue from External Customer [Line Items]
Product or Service	78,572us-gaap_OtherAlternativeEnergySalesRevenue / us-gaap_ProductOrServiceAxis = rex_EthanolMember	119,106us-gaap_OtherAlternativeEnergySalesRevenue / us-gaap_ProductOrServiceAxis = rex_EthanolMember
Dried distillers grains [Member]
Revenue from External Customer [Line Items]
Product or Service	20,251us-gaap_OtherAlternativeEnergySalesRevenue / us-gaap_ProductOrServiceAxis = rex_DriedDistillersGrainsMember	31,029us-gaap_OtherAlternativeEnergySalesRevenue / us-gaap_ProductOrServiceAxis = rex_DriedDistillersGrainsMember
Non-food grade corn oil [Member]
Revenue from External Customer [Line Items]
Product or Service	3,959us-gaap_OtherAlternativeEnergySalesRevenue / us-gaap_ProductOrServiceAxis = rex_NonfoodGradeCornOilMember	3,930us-gaap_OtherAlternativeEnergySalesRevenue / us-gaap_ProductOrServiceAxis = rex_NonfoodGradeCornOilMember
Modified distillers grains [Member]
Revenue from External Customer [Line Items]
Product or Service	2,305us-gaap_OtherAlternativeEnergySalesRevenue / us-gaap_ProductOrServiceAxis = rex_ModifiedDistillersGrainsMember	1,490us-gaap_OtherAlternativeEnergySalesRevenue / us-gaap_ProductOrServiceAxis = rex_ModifiedDistillersGrainsMember
Other [Member]
Revenue from External Customer [Line Items]
Product or Service	$ 110us-gaap_OtherAlternativeEnergySalesRevenue / us-gaap_ProductOrServiceAxis = rex_OtherMember	$ 369us-gaap_OtherAlternativeEnergySalesRevenue / us-gaap_ProductOrServiceAxis = rex_OtherMember

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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 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688



Reference 2: 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=51678428&loc=d3e62136-109447



Reference 3: 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=51678428&loc=d3e62246-109447

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- Details

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