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NET SALES AND REVENUE (Details) - Schedule of Sales of Consolidated Ethanol Plants (USD $) In Thousands, unless otherwise specified	3 Months Ended																12 Months Ended
	Jan. 31, 2015		Oct. 31, 2014		Jul. 31, 2014		Apr. 30, 2014		Jan. 31, 2014		Oct. 31, 2013		Jul. 31, 2013		Apr. 30, 2013		Jan. 31, 2015	Jan. 31, 2014	Jan. 31, 2013
Revenue from External Customer [Line Items]
Sales	$ 127,651us-gaap_SalesRevenueNet	[1]	$ 138,424us-gaap_SalesRevenueNet	[1]	$ 150,231us-gaap_SalesRevenueNet	[1]	$ 155,924us-gaap_SalesRevenueNet	[1]	$ 146,073us-gaap_SalesRevenueNet	[1]	$ 166,167us-gaap_SalesRevenueNet	[1]	$ 175,385us-gaap_SalesRevenueNet	[1]	$ 178,420us-gaap_SalesRevenueNet	[1]	$ 572,230us-gaap_SalesRevenueNet	$ 666,045us-gaap_SalesRevenueNet	$ 656,589us-gaap_SalesRevenueNet
Ethanol [Member]
Revenue from External Customer [Line Items]
Sales																	452,831us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = rex_EthanolMember	500,203us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = rex_EthanolMember	495,249us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = rex_EthanolMember
Dried Distillers Grains [Member]
Revenue from External Customer [Line Items]
Sales																	96,328us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = rex_DriedDistillersGrainsMember	125,575us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = rex_DriedDistillersGrainsMember	114,732us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = rex_DriedDistillersGrainsMember
Non-Food Grade Corn Oil [Member]
Revenue from External Customer [Line Items]
Sales																	16,985us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = rex_NonFoodGradeCornOilMember	18,788us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = rex_NonFoodGradeCornOilMember	16,037us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = rex_NonFoodGradeCornOilMember
Modified Distillers Grains [Member]
Revenue from External Customer [Line Items]
Sales																	4,814us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = rex_ModifiedDistillersGrainsMember	18,998us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = rex_ModifiedDistillersGrainsMember	27,463us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = rex_ModifiedDistillersGrainsMember
Other Product [Member]
Revenue from External Customer [Line Items]
Sales																	$ 1,272us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = rex_OtherProductMember	$ 2,481us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = rex_OtherProductMember	$ 3,108us-gaap_SalesRevenueNet / us-gaap_ProductOrServiceAxis = rex_OtherProductMember
[1] Amounts differ from those previously reported as a result of retail operations and certain real estate assets sold being reclassified as discontinued operations and other reclassifications.

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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ 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 SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

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