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COMMON STOCK (Details) (USD $)
 12 Months Ended
Jan. 31, 2015
Jan. 31, 2014
Jan. 31, 2013
COMMON STOCK (Details) [Line Items]      
Treasury Stock, Shares, Acquired 283,979us-gaap_TreasuryStockSharesAcquired 137,015us-gaap_TreasuryStockSharesAcquired 278,369us-gaap_TreasuryStockSharesAcquired
Treasury Stock, Value, Acquired, Cost Method (in Dollars) $ 18,238,000us-gaap_TreasuryStockValueAcquiredCostMethod $ 3,486,000us-gaap_TreasuryStockValueAcquiredCostMethod $ 5,445,000us-gaap_TreasuryStockValueAcquiredCostMethod
Stock Repurchase Program Number of Additional Shares Authorized to be Repurchased 497,582rex_StockRepurchaseProgramNumberOfAdditionalSharesAuthorizedToBeRepurchased    
Employee Stock Option [Member]      
COMMON STOCK (Details) [Line Items]      
Treasury Stock, Shares, Acquired 1,555us-gaap_TreasuryStockSharesAcquired
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		   32,935us-gaap_TreasuryStockSharesAcquired
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
Treasury Stock, Value, Acquired, Cost Method (in Dollars) $ 100,000us-gaap_TreasuryStockValueAcquiredCostMethod
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember		   $ 1,071,000us-gaap_TreasuryStockValueAcquiredCostMethod
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember