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COMMITMENTS (Details) (USD $)	12 Months Ended
	Jan. 31, 2015	Jan. 31, 2014	Jan. 31, 2013
COMMITMENTS (Details) [Line Items]
Operating Leases, Future Minimum Payments Due	$ 1,137,000us-gaap_OperatingLeasesFutureMinimumPaymentsDue
Natural Gas Pipeline [Member] | One Earth Energy [Member]
COMMITMENTS (Details) [Line Items]
Lease Expiration Period	10 years
Operating Leases, Future Minimum Payments Due	4,380,000us-gaap_OperatingLeasesFutureMinimumPaymentsDue / dei_LegalEntityAxis = rex_OneEarthEnergyMember / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = rex_NaturalGasPipelineMember
Number of installments payable	120rex_NumberOfInstalmentsPayable / dei_LegalEntityAxis = rex_OneEarthEnergyMember / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = rex_NaturalGasPipelineMember
Installment amount	36,500rex_InstallmentAmount / dei_LegalEntityAxis = rex_OneEarthEnergyMember / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = rex_NaturalGasPipelineMember
Operating Leases, Rent Expense, Net	438,000us-gaap_OperatingLeasesRentExpenseNet / dei_LegalEntityAxis = rex_OneEarthEnergyMember / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = rex_NaturalGasPipelineMember	438,000us-gaap_OperatingLeasesRentExpenseNet / dei_LegalEntityAxis = rex_OneEarthEnergyMember / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = rex_NaturalGasPipelineMember	438,000us-gaap_OperatingLeasesRentExpenseNet / dei_LegalEntityAxis = rex_OneEarthEnergyMember / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = rex_NaturalGasPipelineMember
Railcars One [Member] | One Earth Energy [Member]
COMMITMENTS (Details) [Line Items]
Operating Leases, Rent Expense, Net	2,572,000us-gaap_OperatingLeasesRentExpenseNet / dei_LegalEntityAxis = rex_OneEarthEnergyMember / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = rex_RailcarsOneMember	2,055,000us-gaap_OperatingLeasesRentExpenseNet / dei_LegalEntityAxis = rex_OneEarthEnergyMember / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = rex_RailcarsOneMember	1,723,000us-gaap_OperatingLeasesRentExpenseNet / dei_LegalEntityAxis = rex_OneEarthEnergyMember / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = rex_RailcarsOneMember
Lease Expiration Date	May 31, 2022
Distillers Grains Marketing Services [Member] | One Earth Energy [Member]
COMMITMENTS (Details) [Line Items]
Expiration Date of Grain Agreement	Jul. 01, 2015
Marketing Expense	613,000us-gaap_MarketingExpense / dei_LegalEntityAxis = rex_OneEarthEnergyMember / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = rex_DistillersGrainsMarketingServicesMember	640,000us-gaap_MarketingExpense / dei_LegalEntityAxis = rex_OneEarthEnergyMember / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = rex_DistillersGrainsMarketingServicesMember	627,000us-gaap_MarketingExpense / dei_LegalEntityAxis = rex_OneEarthEnergyMember / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = rex_DistillersGrainsMarketingServicesMember
Distillers Grains Marketing Services [Member] | Nu Gen Energy [Member]
COMMITMENTS (Details) [Line Items]
Expiration Date of Grain Agreement	Jul. 31, 2015
Marketing Expense	577,000us-gaap_MarketingExpense / dei_LegalEntityAxis = rex_NuGenEnergyMember / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = rex_DistillersGrainsMarketingServicesMember	838,000us-gaap_MarketingExpense / dei_LegalEntityAxis = rex_NuGenEnergyMember / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = rex_DistillersGrainsMarketingServicesMember	833,000us-gaap_MarketingExpense / dei_LegalEntityAxis = rex_NuGenEnergyMember / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = rex_DistillersGrainsMarketingServicesMember
RailCars [Member] | Nu Gen Energy [Member]
COMMITMENTS (Details) [Line Items]
Operating Leases, Rent Expense, Net	$ 4,452,000us-gaap_OperatingLeasesRentExpenseNet / dei_LegalEntityAxis = rex_NuGenEnergyMember / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = rex_RailCarsMember	$ 4,350,000us-gaap_OperatingLeasesRentExpenseNet / dei_LegalEntityAxis = rex_NuGenEnergyMember / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = rex_RailCarsMember	$ 2,714,000us-gaap_OperatingLeasesRentExpenseNet / dei_LegalEntityAxis = rex_NuGenEnergyMember / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = rex_RailCarsMember
One Earth Energy And Nu Gen Energy [Member]
COMMITMENTS (Details) [Line Items]
Quantity of Bushels under Forward Purchase Contract (in US Bushels)	10,000,000rex_QuantityOfBushelsUnderForwardPurchaseContract / dei_LegalEntityAxis = rex_OneEarthEnergyAndNuGenEnergyMember
Quantity of Ethanol under Sales Commitment (in US Gallons)	50,200,000rex_QuantityOfEthanolUnderSalesCommitment / dei_LegalEntityAxis = rex_OneEarthEnergyAndNuGenEnergyMember
Quantity of Distillers Grains Under Sales Commitment (in US Tons)	126,000rex_QuantityOfDistillersGrainsUnderSalesCommitment / dei_LegalEntityAxis = rex_OneEarthEnergyAndNuGenEnergyMember
Quantity of Non-food Grade Corn Oil Under Sales Commitments (in Pounds)	6,800,000rex_QuantityOfNonFoodGradeCornOilUnderSalesCommitments / dei_LegalEntityAxis = rex_OneEarthEnergyAndNuGenEnergyMember
One Earth Energy [Member]
COMMITMENTS (Details) [Line Items]
Expiration Date of Grain Agreement	Oct. 31, 2015
Percentage of Grain Purchase Under Agreement	100.00%rex_PercentageOfGrainPurchaseUnderAgreement / dei_LegalEntityAxis = rex_OneEarthEnergyMember	100.00%rex_PercentageOfGrainPurchaseUnderAgreement / dei_LegalEntityAxis = rex_OneEarthEnergyMember	100.00%rex_PercentageOfGrainPurchaseUnderAgreement / dei_LegalEntityAxis = rex_OneEarthEnergyMember
Maximum Period to Notify Other Party for Grain Agreement Period Extension	180 months

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Expenditures for planning and executing the conception, pricing, promotion, and distribution of ideas, goods, and services. Costs of public relations and corporate promotions are typically considered to be marketing costs.

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