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LONG-TERM DEBT AND INTEREST RATE SWAPS (Details) (USD $)	12 Months Ended	24 Months Ended
	Jan. 31, 2015	Jan. 31, 2015	Jan. 31, 2014
LONG-TERM DEBT AND INTEREST RATE SWAPS (Details) [Line Items]
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum		3.15%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Maximum		4.00%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum
Repayments of Debt	$ 75,700,000us-gaap_RepaymentsOfDebt
Long-term Debt, Fair Value			75,100,000us-gaap_LongTermDebtFairValue
Derivative Liability, Notional Amount			33,400,000us-gaap_DerivativeLiabilityNotionalAmount
Derivative Liability			1,141,000us-gaap_DerivativeLiabilities
Interest Rate Swap One [Member] | One Earth Energy [Member]
LONG-TERM DEBT AND INTEREST RATE SWAPS (Details) [Line Items]
Derivative Liability, Notional Amount	50,000,000us-gaap_DerivativeLiabilityNotionalAmount / dei_LegalEntityAxis = rex_OneEarthEnergyMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = rex_InterestRateSwapOneMember	50,000,000us-gaap_DerivativeLiabilityNotionalAmount / dei_LegalEntityAxis = rex_OneEarthEnergyMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = rex_InterestRateSwapOneMember
Swap Termination Date	July 8, 2014
Debt Instrument, Basis Spread on Variable Rate	7.90%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / dei_LegalEntityAxis = rex_OneEarthEnergyMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = rex_InterestRateSwapOneMember
Interest Rate Swap Two [Member] | One Earth Energy [Member]
LONG-TERM DEBT AND INTEREST RATE SWAPS (Details) [Line Items]
Derivative Liability, Notional Amount	25,000,000us-gaap_DerivativeLiabilityNotionalAmount / dei_LegalEntityAxis = rex_OneEarthEnergyMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = rex_InterestRateSwapTwoMember	25,000,000us-gaap_DerivativeLiabilityNotionalAmount / dei_LegalEntityAxis = rex_OneEarthEnergyMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = rex_InterestRateSwapTwoMember
Swap Termination Date	July 31, 2011
Debt Instrument, Basis Spread on Variable Rate	5.49%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / dei_LegalEntityAxis = rex_OneEarthEnergyMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = rex_InterestRateSwapTwoMember
Interest Rate Swap [Member] | One Earth Energy [Member]
LONG-TERM DEBT AND INTEREST RATE SWAPS (Details) [Line Items]
Derivative Liability			1,100,000us-gaap_DerivativeLiabilities / dei_LegalEntityAxis = rex_OneEarthEnergyMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_InterestRateSwapMember
Interest Rate Swap [Member]
LONG-TERM DEBT AND INTEREST RATE SWAPS (Details) [Line Items]
Derivative Liability, Notional Amount			33,444,000us-gaap_DerivativeLiabilityNotionalAmount / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_InterestRateSwapMember
Derivative Liability			$ 1,141,000us-gaap_DerivativeLiabilities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_InterestRateSwapMember

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Maximum contractual interest rate for funds borrowed, under the debt agreement.

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Minimum contractual interest rate for funds borrowed, under the debt agreement.

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Nominal or face amount used to calculate payments on the derivative liability.

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The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

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