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Segment Reporting (Details) - Schedule Of Segment Results And Assets - USD ($) $ in Thousands		3 Months Ended
		Apr. 30, 2021	Apr. 30, 2020
Segment Reporting Information [Line Items]
Net sales and revenue:		$ 164,104	$ 83,250
Segment gross (loss) profit:		17,802	(9,330)
Income (loss) before income taxes:		8,427	(13,743)
(Provision) benefit for income taxes:		(29)	5,313
Net income (loss) attributable to REX common shareholders:		7,784	(7,635)
Sales of products, ethanol and by-products segment:		164,042	83,235
Ethanol [Member]
Segment Reporting Information [Line Items]
Net sales and revenue:		164,042	83,235
Segment gross (loss) profit:		19,477	(8,223)
Income (loss) before income taxes:		11,082	(12,351)
(Provision) benefit for income taxes:		(2,436)	4,161
Net income (loss) attributable to REX common shareholders:		7,952	(7,433)
Sales of products, ethanol and by-products segment:		126,069	60,597
Refined Coal [Member]
Segment Reporting Information [Line Items]
Net sales and revenue:	[1]	62	15
Segment gross (loss) profit:		(1,675)	(1,107)
Income (loss) before income taxes:		(1,795)	(847)
(Provision) benefit for income taxes:		2,195	959
Net income (loss) attributable to REX common shareholders:		480	150
Sales of products, ethanol and by-products segment:		62	15
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Income (loss) before income taxes:		(860)	(545)
(Provision) benefit for income taxes:		212	193
Net income (loss) attributable to REX common shareholders:		(648)	(352)
Dried Distillers Grains [Member]
Segment Reporting Information [Line Items]
Sales of products, ethanol and by-products segment:		31,119	18,918
Non-Food Grade Corn Oil [Member]
Segment Reporting Information [Line Items]
Sales of products, ethanol and by-products segment:		5,594	3,188
Modified Distillers Grains [Member]
Segment Reporting Information [Line Items]
Sales of products, ethanol and by-products segment:		2,293	457
Derivative Financial Instruments, Assets [Member]
Segment Reporting Information [Line Items]
Sales of products, ethanol and by-products segment:		(1,126)
Other Segments [Member]
Segment Reporting Information [Line Items]
Sales of products, ethanol and by-products segment:		$ 93	$ 75
[1] The Company records sales in the refined coal segment net of the cost of coal as the Company purchases the coal feedstock from the customer to which refined coal is sold.

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