Document And Entity Information - shares	9 Months Ended
	Oct. 31, 2021	Dec. 02, 2021
Document Information Line Items
Entity Registrant Name	REX AMERICAN RESOURCES CORPORATION
Trading Symbol	REX
Document Type	10-Q/A
Current Fiscal Year End Date	--01-31
Entity Common Stock, Shares Outstanding		5,920,351
Amendment Flag	true
Amendment Description	REX American Resources Corporation (the “Company”) is filing this Amendment No. 1 on Form 10-Q/A (this “Amendment”) to its Quarterly Report on Form 10-Q for the period ended October 31, 2021, originally filed with the Securities and Exchange Commission (“SEC”) on December 3, 2021 (the “Original Filing”) to include in Item 2 of Part II certain repurchases of stock during the quarter that commenced August 1, 2021 and ended October 31, 2021 that were inadvertently omitted from the Original Filing. These stock repurchases were fully reflected in the Company’s consolidated financial statements included in the Original Filing.This Amendment does not give effect to any subsequent events after the filing date of the Original Filing, including the 3-for-1 stock split on August 5, 2022. Other than the information specifically identified in this Amendment, this Amendment does not modify or update the Original Filing in any way.
Entity Central Index Key	0000744187
Entity Current Reporting Status	Yes
Entity Filer Category	Accelerated Filer
Document Period End Date	Oct. 31, 2021
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q3
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Document Quarterly Report	true
Document Transition Report	false
Entity File Number	001-09097
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	31-1095548
Entity Address, Address Line One	7720 Paragon Road
Entity Address, City or Town	Dayton
Entity Address, State or Province	OH
Entity Address, Postal Zip Code	45459
City Area Code	(937)
Local Phone Number	276-3931
Title of 12(b) Security	Common stock, $0.01 par value
Security Exchange Name	NYSE
Entity Interactive Data Current	Yes