Document And Entity Information - shares	9 Months Ended
	Oct. 31, 2018	Nov. 30, 2018
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		6,327,178
Amendment Flag	false
Entity Central Index Key	0000744187
Entity Current Reporting Status	Yes
Entity Filer Category	Accelerated Filer
Document Period End Date	Oct. 31, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q3
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Ex Transition Period	false