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Accounting Policies (Details) (USD $)	3 Months Ended
	Apr. 30, 2015	Apr. 30, 2014
Accounting Policies (Details) [Line Items]
Interest Paid	$ 0us-gaap_InterestPaid	$ 820,000us-gaap_InterestPaid
Derivative Settlement on Interest Rate Swap	0rex_DerivativeSettlementOnInterestRateSwap	398,000rex_DerivativeSettlementOnInterestRateSwap
Income Taxes Paid	0us-gaap_IncomeTaxesPaid	10,050,000us-gaap_IncomeTaxesPaid
Unrecognized Tax Benefit	1,191,000rex_UnrecognizedTaxBenefit
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	481,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	24,000us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate
Property, Plant and Equipment, Depreciation Methods	Depreciation is computed using the straight-line method.
Asset Impairment Charges	$ 125,000,000,000us-gaap_AssetImpairmentCharges	$ 68,000,000,000us-gaap_AssetImpairmentCharges
Number of Ethanol Entities Under Majority Ownership Interest	2rex_NumberOfEthanolEntitiesUnderMajorityOwnershipInterest
Building and Building Improvements [Member] | Minimum [Member]
Accounting Policies (Details) [Line Items]
Property, Plant and Equipment, Useful Life	15 years
Building and Building Improvements [Member] | Maximum [Member]
Accounting Policies (Details) [Line Items]
Property, Plant and Equipment, Useful Life	40 years
Fixtures And Equipment [Member] | Minimum [Member]
Accounting Policies (Details) [Line Items]
Property, Plant and Equipment, Useful Life	3 years
Fixtures And Equipment [Member] | Maximum [Member]
Accounting Policies (Details) [Line Items]
Property, Plant and Equipment, Useful Life	20 years
Cost of Sales [Member]
Accounting Policies (Details) [Line Items]
Maximum Percentage of Equity Ownership Interest Which May be Considered for Equity Method of Accounting	20.00%rex_MaximumPercentageOfEquityOwnershipInterestWhichMayBeConsideredForEquityMethodOfAccounting / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember

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Value of derivative settlement on interest rate swap during the period.

+ References

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- Definition

Maximum percentage of equity ownership interest which may be considered for equity method of accounting.

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No definition available.

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- Definition

Number of ethanol entities which are majority ownership interests.

+ References

No definition available.

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- Definition

No authoritative reference available.

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No definition available.

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- Definition

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

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-SubTopic 10

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The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income.

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-Name Accounting Standards Codification

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The amount of cash paid for interest during the period.

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Description of the methodology for computing depreciation for classes of depreciable assets.

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-Publisher FASB

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-Topic 360

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

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-Section 50

-Paragraph 15

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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