Document And Entity Information	3 Months Ended
	Apr. 30, 2012	Jun. 05, 2012
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		8,378,280
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	Apr. 30, 2012
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	Q1