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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
 12 Months Ended
Jan. 31, 2015
Jan. 31, 2014
Jan. 31, 2013
CASH FLOWS FROM OPERATING ACTIVITIES:      
Net income (loss) $ 103,714,000us-gaap_ProfitLoss $ 40,229,000us-gaap_ProfitLoss $ (1,588,000)us-gaap_ProfitLoss
Depreciation and amortization 16,787,000us-gaap_DepreciationDepletionAndAmortization 17,284,000us-gaap_DepreciationDepletionAndAmortization 16,602,000us-gaap_DepreciationDepletionAndAmortization
Impairment charges on real estate 68,000us-gaap_ImpairmentOfRealEstate 55,000us-gaap_ImpairmentOfRealEstate 562,000us-gaap_ImpairmentOfRealEstate
Income from equity method investments (32,229,000)us-gaap_IncomeLossFromEquityMethodInvestments (17,175,000)us-gaap_IncomeLossFromEquityMethodInvestments (627,000)us-gaap_IncomeLossFromEquityMethodInvestments
Dividends received from equity method investments 22,889,000us-gaap_IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions 5,804,000us-gaap_IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions 2,206,000us-gaap_IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions
Derivative financial instruments (1,141,000)us-gaap_IncreaseDecreaseInDerivativeLiabilities (1,648,000)us-gaap_IncreaseDecreaseInDerivativeLiabilities (1,446,000)us-gaap_IncreaseDecreaseInDerivativeLiabilities
(Gain) loss on disposal of real estate and property and equipment (275,000)rex_GainOnDisposalOfRealEstateAndPropertyAndEquipment (1,015,000)rex_GainOnDisposalOfRealEstateAndPropertyAndEquipment 357,000rex_GainOnDisposalOfRealEstateAndPropertyAndEquipment
Deferred income tax 22,473,000us-gaap_DeferredIncomeTaxExpenseBenefit 15,987,000us-gaap_DeferredIncomeTaxExpenseBenefit (504,000)us-gaap_DeferredIncomeTaxExpenseBenefit
Excess tax benefit from stock option exercises (441,000)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities (64,000)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities  
Changes in assets and liabilities:      
Accounts receivable 7,692,000us-gaap_IncreaseDecreaseInAccountsReceivable (4,919,000)us-gaap_IncreaseDecreaseInAccountsReceivable 1,217,000us-gaap_IncreaseDecreaseInAccountsReceivable
Inventory 1,308,000us-gaap_IncreaseDecreaseInInventories 5,549,000us-gaap_IncreaseDecreaseInInventories 5,430,000us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other assets (1,929,000)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets (1,490,000)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets 498,000us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Income taxes refundable (1,985,000)us-gaap_IncreaseDecreaseInIncomeTaxesReceivable 1,480,000us-gaap_IncreaseDecreaseInIncomeTaxesReceivable 719,000us-gaap_IncreaseDecreaseInIncomeTaxesReceivable
Accounts payable-trade 2,030,000us-gaap_IncreaseDecreaseInAccountsPayableTrade 1,721,000us-gaap_IncreaseDecreaseInAccountsPayableTrade (1,448,000)us-gaap_IncreaseDecreaseInAccountsPayableTrade
Accrued expenses and other liabilities (1,745,000)us-gaap_IncreaseDecreaseInOtherOperatingLiabilities 2,637,000us-gaap_IncreaseDecreaseInOtherOperatingLiabilities (4,930,000)us-gaap_IncreaseDecreaseInOtherOperatingLiabilities
Net cash provided by operating activities 137,216,000us-gaap_NetCashProvidedByUsedInOperatingActivities 64,435,000us-gaap_NetCashProvidedByUsedInOperatingActivities 17,048,000us-gaap_NetCashProvidedByUsedInOperatingActivities
CASH FLOWS FROM INVESTING ACTIVITIES:      
Capital expenditures (9,927,000)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (3,518,000)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (3,684,000)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Repayment of note receivable 6,000us-gaap_ProceedsFromCollectionOfNotesReceivable 681,000us-gaap_ProceedsFromCollectionOfNotesReceivable  
Proceeds from sale of real estate and property and equipment 1,778,000rex_ProceedsFromSaleOfRealEstateAndPropertyAndEquipment 8,876,000rex_ProceedsFromSaleOfRealEstateAndPropertyAndEquipment 2,849,000rex_ProceedsFromSaleOfRealEstateAndPropertyAndEquipment
Restricted cash 500,000us-gaap_IncreaseDecreaseInRestrictedCash (500,000)us-gaap_IncreaseDecreaseInRestrictedCash  
Restricted investments and deposits 323,000us-gaap_ProceedsFromSaleOfRestrictedInvestments 1,293,000us-gaap_ProceedsFromSaleOfRestrictedInvestments 860,000us-gaap_ProceedsFromSaleOfRestrictedInvestments
Net cash (used in) provided by investing activities (7,320,000)us-gaap_NetCashProvidedByUsedInInvestingActivities 6,832,000us-gaap_NetCashProvidedByUsedInInvestingActivities 25,000us-gaap_NetCashProvidedByUsedInInvestingActivities
CASH FLOWS FROM FINANCING ACTIVITIES:      
Payments of long term debt (75,726,000)us-gaap_RepaymentsOfLongTermDebt (31,203,000)us-gaap_RepaymentsOfLongTermDebt (16,820,000)us-gaap_RepaymentsOfLongTermDebt
Stock options exercised 931,000us-gaap_ProceedsFromStockOptionsExercised 1,072,000us-gaap_ProceedsFromStockOptionsExercised 265,000us-gaap_ProceedsFromStockOptionsExercised
Payments to noncontrolling interests holders (4,856,000)us-gaap_PaymentsToMinorityShareholders (1,638,000)us-gaap_PaymentsToMinorityShareholders (2,085,000)us-gaap_PaymentsToMinorityShareholders
Excess tax benefit from stock option exercises 441,000us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities 64,000us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities  
Treasury stock acquired (18,138,000)us-gaap_PaymentsForRepurchaseOfCommonStock (3,486,000)us-gaap_PaymentsForRepurchaseOfCommonStock (4,373,000)us-gaap_PaymentsForRepurchaseOfCommonStock
Net cash used in financing activities (97,348,000)us-gaap_NetCashProvidedByUsedInFinancingActivities (35,191,000)us-gaap_NetCashProvidedByUsedInFinancingActivities (23,013,000)us-gaap_NetCashProvidedByUsedInFinancingActivities
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 32,548,000us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 36,076,000us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (5,940,000)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
CASH AND CASH EQUIVALENTS-Beginning of year 105,149,000us-gaap_CashAndCashEquivalentsAtCarryingValue 69,073,000us-gaap_CashAndCashEquivalentsAtCarryingValue 75,013,000us-gaap_CashAndCashEquivalentsAtCarryingValue
CASH AND CASH EQUIVALENTS-End of year 137,697,000us-gaap_CashAndCashEquivalentsAtCarryingValue 105,149,000us-gaap_CashAndCashEquivalentsAtCarryingValue 69,073,000us-gaap_CashAndCashEquivalentsAtCarryingValue
Non cash financing activities-Cashless exercises of stock options 100,000us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised   1,071,000us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
Non cash investing activities-Accrued capital expenditures 804,000us-gaap_NoncashOrPartNoncashAcquisitionFixedAssetsAcquired1 250,000us-gaap_NoncashOrPartNoncashAcquisitionFixedAssetsAcquired1  
Non cash financing activities-Accrued noncontrolling interest holders payments     23,000rex_NonCashActivitiesAccruedNoncontrollingInterestHoldersPayments
Non cash investing activities- Loan receivable granted in connection with sale of real estate $ 475,000us-gaap_NoncashOrPartNoncashAcquisitionAccountsReceivableAcquired1