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DISCONTINUED OPERATIONS (Details) - Schedule Of Discontinued Items Statement of Operations - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Jan. 31, 2022
Oct. 31, 2021
Jul. 31, 2021
Apr. 30, 2021
Jan. 31, 2022
Jan. 31, 2021
Schedule Of Discontinued Items Statement Of Operations Abstract            
Net sales and revenue [1]         $ 400 $ 182
Cost of Sales         8,602 5,854
Gross loss         (8,202) (5,672)
Selling, general and administrative         698 22
Loss before income taxes         (8,900) (5,694)
Benefit for income taxes         13,295 6,554
Net income from discontinued operations, net of tax         4,395 860
Net loss attributable to noncontrolling interests [2]         397 261
Net income attributable to REX common shareholders $ 159 $ 1,952 $ 2,166 $ 515 $ 4,792 $ 1,121
[1] Refined coal sales were recorded net of the cost of coal as the Company purchased the coal feedstock from the customer to which the processed refined coal was sold.
[2] Net loss attributable to noncontrolling interest represents the minority investor’s share of the loss before income taxes as noncontrolling interests does not include any gain from the refined coal tax credits.