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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (USD $) | Common Stock [Member] | Treasury Stock [Member] | Additional Paid-in Capital [Member] | Retained Earnings [Member] | Noncontrolling Interest [Member] | Total
--- | --- | --- | --- | --- | --- | ---
Balance at Jan. 31, 2012 | $ 299,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ (215,105,000)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | $ 142,994,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ 324,323,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ 29,332,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | $ 281,843,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
Balance (in Shares) at Jan. 31, 2012 | 29,853,000 us-gaap_SharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 21,523,000 us-gaap_SharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |  |
Net income |  |  |  | (2,295,000)us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 707,000 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | (1,588,000)us-gaap_ProfitLoss
Treasury stock acquired |  | (5,445,000)us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |  | (5,445,000)us-gaap_TreasuryStockValueAcquiredCostMethod
Treasury stock acquired (in Shares) |  | 278,000 us-gaap_TreasuryStockSharesAcquired / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |  | 278,369 us-gaap_TreasuryStockSharesAcquired
Noncontrolling interests distribution and other |  |  |  |  | (2,108,000)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | (2,108,000)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders
Stock options and related tax effects |  | 1,000,000 rex_StockIssuedDuringPeriodValueStockOptionsAndRelatedTaxEffects / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 581,000 rex_StockIssuedDuringPeriodValueStockOptionsAndRelatedTaxEffects / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | 1,581,000 rex_StockIssuedDuringPeriodValueStockOptionsAndRelatedTaxEffects
Stock options and related tax effects (in Shares) |  | (100,000)rex_StockIssuedDuringPeriodSharesStockOptionsAndRelatedTaxEffects / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |  |
Balance at Jan. 31, 2013 | 299,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | (219,550,000)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 143,575,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 322,028,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 27,931,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | 274,283,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
Balance (in Shares) at Jan. 31, 2013 | 29,853,000 us-gaap_SharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 21,701,000 us-gaap_SharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |  |
Net income |  |  |  | 35,073,000 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 5,156,000 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | 40,229,000 us-gaap_ProfitLoss
Treasury stock acquired |  | (3,486,000)us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |  | (3,486,000)us-gaap_TreasuryStockValueAcquiredCostMethod
Treasury stock acquired (in Shares) |  | 137,000 us-gaap_TreasuryStockSharesAcquired / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |  | 137,015 us-gaap_TreasuryStockSharesAcquired
Noncontrolling interests distribution and other |  |  |  |  | (1,615,000)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | (1,615,000)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders
Stock options and related tax effects |  | 866,000 rex_StockIssuedDuringPeriodValueStockOptionsAndRelatedTaxEffects / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 476,000 rex_StockIssuedDuringPeriodValueStockOptionsAndRelatedTaxEffects / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | 1,342,000 rex_StockIssuedDuringPeriodValueStockOptionsAndRelatedTaxEffects
Stock options and related tax effects (in Shares) |  | (85,000)rex_StockIssuedDuringPeriodSharesStockOptionsAndRelatedTaxEffects / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |  |
Balance at Jan. 31, 2014 | 299,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | (222,170,000)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 144,051,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 357,101,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 31,472,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | 310,753,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
Balance (in Shares) at Jan. 31, 2014 | 29,853,000 us-gaap_SharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 21,753,000 us-gaap_SharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |  |
Net income |  |  |  | 87,337,000 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 16,377,000 us-gaap_ProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | 103,714,000 us-gaap_ProfitLoss
Treasury stock acquired |  | (18,238,000)us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |  | (18,238,000)us-gaap_TreasuryStockValueAcquiredCostMethod
Treasury stock acquired (in Shares) |  | 284,000 us-gaap_TreasuryStockSharesAcquired / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |  | 283,979 us-gaap_TreasuryStockSharesAcquired
Noncontrolling interests distribution and other |  |  |  |  | (4,856,000)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | (4,856,000)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders
Stock options and related tax effects |  | 851,000 rex_StockIssuedDuringPeriodValueStockOptionsAndRelatedTaxEffects / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | 740,000 rex_StockIssuedDuringPeriodValueStockOptionsAndRelatedTaxEffects / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | 1,591,000 rex_StockIssuedDuringPeriodValueStockOptionsAndRelatedTaxEffects
Stock options and related tax effects (in Shares) |  | (83,000)rex_StockIssuedDuringPeriodSharesStockOptionsAndRelatedTaxEffects / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |  |
Balance at Jan. 31, 2015 | $ 299,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ (239,557,000)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember | $ 144,791,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ 444,438,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ 42,993,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / us-gaap_StatementEquityComponentsAxis = us-gaap_NoncontrollingInterestMember | $ 392,964,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
Balance (in Shares) at Jan. 31, 2015 | 29,853,000 us-gaap_SharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 21,954,000 us-gaap_SharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember |  |  |  |

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