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Document And Entity Information
 9 Months Ended
Oct. 31, 2011
Dec. 01, 2011
Document and Entity Information [Abstract]    
Entity Registrant Name REX AMERICAN RESOURCES Corp  
Document Type 10-Q  
Current Fiscal Year End Date --01-31  
Entity Common Stock, Shares Outstanding   8,321,819
Amendment Flag false  
Entity Central Index Key 0000744187  
Entity Current Reporting Status Yes  
Entity Voluntary Filers No  
Entity Filer Category Accelerated Filer  
Entity Well-known Seasoned Issuer No  
Document Period End Date Oct. 31, 2011  
Document Fiscal Year Focus 2012  
Document Fiscal Period Focus Q3