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INCOME TAXES (Details) (USD $)
 12 Months Ended
Jan. 31, 2015
Jan. 31, 2014
Jan. 31, 2013
Jan. 31, 2012
INCOME TAXES (Details) [Line Items]        
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax $ 4,015,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax $ 19,751,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax    
Income to be Generated for Utilization of Alternative Minimum Tax Credit Carryforwards 27,000,000rex_IncomeToBeGeneratedForUtilizationOfAlternativeMinimumTaxCreditCarryforwards      
Deferred Tax Assets, Valuation Allowance 1,752,000us-gaap_DeferredTaxAssetsValuationAllowance 2,017,000us-gaap_DeferredTaxAssetsValuationAllowance 1,891,000us-gaap_DeferredTaxAssetsValuationAllowance 1,676,000us-gaap_DeferredTaxAssetsValuationAllowance
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount (265,000)us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount 126,000us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount 215,000us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount  
Income Taxes Paid 30,142,000us-gaap_IncomeTaxesPaid 3,450,000us-gaap_IncomeTaxesPaid 51,000us-gaap_IncomeTaxesPaid  
Proceeds from Income Tax Refunds 53,000us-gaap_ProceedsFromIncomeTaxRefunds 38,000us-gaap_ProceedsFromIncomeTaxRefunds 1,005,000us-gaap_ProceedsFromIncomeTaxRefunds  
Unrecognized Tax Benefit 1,191,000rex_UnrecognizedTaxBenefit      
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued 467,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued      
State and Local Jurisdiction [Member]        
INCOME TAXES (Details) [Line Items]        
Operating Loss Carryforwards $ 18,000,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember