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INCOME TAXES (Details) - Schedule of Effective Income Tax Reconciliation	12 Months Ended
	Jan. 31, 2015	Jan. 31, 2014	Jan. 31, 2013
Schedule of Effective Income Tax Reconciliation [Abstract]
Federal income tax at statutory rate	35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
State and local taxes, net of federal tax benefit	3.60%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	4.50%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	5.60%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Net change in valuation allowance	(0.20%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	0.20%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance	(5.00%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance
Domestic production activities deduction	(1.10%)us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivities	(1.50%)us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivities
Uncertain tax positions		(0.10%)rex_EffectiveIncomeTaxRateReconciliationUncertainTaxPositions	(1.50%)rex_EffectiveIncomeTaxRateReconciliationUncertainTaxPositions
Noncontrolling interest	(4.00%)us-gaap_EffectiveIncomeTaxRateReconciliationMinorityInterestIncomeExpense	(3.40%)us-gaap_EffectiveIncomeTaxRateReconciliationMinorityInterestIncomeExpense	6.70%us-gaap_EffectiveIncomeTaxRateReconciliationMinorityInterestIncomeExpense
Other	(0.80%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments	(0.10%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments	1.80%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Total	32.50%us-gaap_EffectiveIncomeTaxRateContinuingOperations	34.60%us-gaap_EffectiveIncomeTaxRateContinuingOperations	42.60%us-gaap_EffectiveIncomeTaxRateContinuingOperations

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Effective income tax rate reconciliation uncertain tax positions.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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