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Discontinued Operations (Details) (USD $)	3 Months Ended
	Apr. 30, 2015	Apr. 30, 2014
Discontinued Operations (Details) [Line Items]
Cash Provided by (Used in) Operating Activities, Discontinued Operations	$ 0us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations
Cash Provided by (Used in) Investing Activities, Discontinued Operations	0us-gaap_CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations	0us-gaap_CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations
Levelland Hockley County Ethanol LLC [Member]
Discontinued Operations (Details) [Line Items]
Cash Provided by (Used in) Operating Activities, Discontinued Operations		$ 17,000,000,000us-gaap_CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = rex_LevellandHockleyCountyEthanolLLCMember

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Amount of cash inflow (outflow) of investing activities of discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 24

-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3521-108585



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

-SubTopic 20

-Section 50

-Paragraph 5B

-Subparagraph (c)(1)

-URI http://asc.fasb.org/extlink&oid=51717284&loc=SL51721673-107760

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- Definition

Amount of cash inflow (outflow) of operating activities of discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 24

-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3521-108585



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

-SubTopic 20

-Section 50

-Paragraph 5B

-Subparagraph (c)(1)

-URI http://asc.fasb.org/extlink&oid=51717284&loc=SL51721673-107760

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