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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $)	12 Months Ended
	Jan. 31, 2015	Jan. 31, 2014	Jan. 31, 2013
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items]
Number of Ethanol Entities Under Ownership Interest	4rex_NumberOfEthanolEntitiesUnderOwnershipInterest
Number of Reportable Segments	1us-gaap_NumberOfReportableSegments
Concentration Risk Number of Customer	4rex_ConcentrationRiskNumberOfCustomer
Concentration Risk, Percentage	74.00%us-gaap_ConcentrationRiskPercentage1	82.00%us-gaap_ConcentrationRiskPercentage1	81.00%us-gaap_ConcentrationRiskPercentage1
Property, Plant and Equipment, Depreciation Methods	Depreciation is computed using the straight-line method
Impairment of Real Estate	$ 68,000us-gaap_ImpairmentOfRealEstate	$ 55,000us-gaap_ImpairmentOfRealEstate	$ 562,000us-gaap_ImpairmentOfRealEstate
Estimated Cash Flow Percentage	25.00%rex_EstimatedCashFlowPercentage
EstimatedFutureCashFlowsTerms	six
Depreciation	16,387,000us-gaap_Depreciation	16,915,000us-gaap_Depreciation	16,081,000us-gaap_Depreciation
Maximum Percentage of Equity Ownership Interest Which May be Considered for Equity Method of Accounting	20.00%rex_MaximumPercentageOfEquityOwnershipInterestWhichMayBeConsideredForEquityMethodOfAccounting
Interest Paid	2,136,000us-gaap_InterestPaid	3,492,000us-gaap_InterestPaid	4,449,000us-gaap_InterestPaid
Derivative Settlement on Interest Rate Swap	1,142,000rex_DerivativeSettlementOnInterestRateSwap	1,687,000rex_DerivativeSettlementOnInterestRateSwap	1,816,000rex_DerivativeSettlementOnInterestRateSwap
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in Shares)	0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross	0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross	0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value	4,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	1,100,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	1,800,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
Deferred Tax Expense from Stock Options Exercised	800,000us-gaap_DeferredTaxExpenseFromStockOptionsExercised	400,000us-gaap_DeferredTaxExpenseFromStockOptionsExercised	200,000us-gaap_DeferredTaxExpenseFromStockOptionsExercised
Cost of Sales [Member]
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items]
Impairment of Real Estate		55,000us-gaap_ImpairmentOfRealEstate / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember	13,000us-gaap_ImpairmentOfRealEstate / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember
Discontinued Operation [Member]
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items]
Impairment of Real Estate			$ 549,000us-gaap_ImpairmentOfRealEstate / us-gaap_IncomeStatementLocationAxis = rex_DiscontinuedOperationMember
Building and Building Improvements [Member] | Minimum [Member]
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items]
Property, Plant and Equipment, Estimated Useful Lives	15
Building and Building Improvements [Member] | Maximum [Member]
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items]
Property, Plant and Equipment, Estimated Useful Lives	40
Fixtures And Equipment [Member] | Minimum [Member]
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items]
Property, Plant and Equipment, Estimated Useful Lives	3
Fixtures And Equipment [Member] | Maximum [Member]
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items]
Property, Plant and Equipment, Estimated Useful Lives	20
Customer Concentration Risk [Member]
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items]
Concentration Risk, Percentage	76.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember	91.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember

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

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- Definition

Number of ethanol entities under ownership interest.

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

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Amount of deferred tax expense from write-off of the deferred tax asset related to deductible stock options at exercise.

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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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The charge against earnings in the period to reduce the carrying amount of real property to fair value.

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The amount of cash paid for interest during the period.

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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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Describes the periods of time over which an entity anticipates to receive utility from its property, plant and equipment (that is, the periods of time over which an entity allocates the initial cost of its property, plant and equipment).

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Gross number of share options (or share units) granted during the period.

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