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Segment Reporting (Details) - Schedule Of Segment Results And Assets - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Oct. 31, 2020
Oct. 31, 2019
Oct. 31, 2020
Oct. 31, 2019
Segment Reporting Information [Line Items]        
Net sales and revenue: $ 124,251 $ 86,671 $ 246,828 $ 297,114
Segment gross (loss) profit: 17,679 (1,758) 7,018 5,892
(Loss) income before income taxes: 15,111 (4,904) (4,711) (4,006)
Benefit (provision) for income taxes: (4,052) 3,231 5,307 9,401
Segment (loss) profit (net of noncontrolling interests): 8,841 (2,052) (542) 3,025
Sales of products, ethanol and by-products segment: 124,217 86,603 246,694 296,826
Ethanol [Member]        
Segment Reporting Information [Line Items]        
Net sales and revenue: 124,217 86,603 246,694 296,826
Segment gross (loss) profit: 18,929 28 11,259 12,312
(Loss) income before income taxes: 17,007 (2,822) 1,397 3,491
Benefit (provision) for income taxes: (5,071) 945 (17) (160)
Segment (loss) profit (net of noncontrolling interests): 9,660 (2,330) 49 684
Sales of products, ethanol and by-products segment: 98,850 66,149 191,971 226,986
Refined Coal [Member]        
Segment Reporting Information [Line Items]        
Net sales and revenue: 34 [1] 68 [1] 134 288
Segment gross (loss) profit: (1,250) (1,786) (4,241) (6,420)
(Loss) income before income taxes: (1,270) (1,648) (4,235) (6,351)
Benefit (provision) for income taxes: 985 2,181 4,863 9,282
Segment (loss) profit (net of noncontrolling interests): (227) 607 821 3,209
Sales of products, ethanol and by-products segment: 34 68 134 288
Corporate and Other [Member]        
Segment Reporting Information [Line Items]        
(Loss) income before income taxes: (626) (434) (1,873) (1,146)
Benefit (provision) for income taxes: 34 105 461 279
Segment (loss) profit (net of noncontrolling interests): (592) (329) (1,412) (868)
Dried Distillers Grains [Member]        
Segment Reporting Information [Line Items]        
Sales of products, ethanol and by-products segment: 20,916 16,627 45,314 51,188
Non-Food Grade Corn Oil [Member]        
Segment Reporting Information [Line Items]        
Sales of products, ethanol and by-products segment: 4,661 3,099 9,162 12,681
Modified Distillers Grains [Member]        
Segment Reporting Information [Line Items]        
Sales of products, ethanol and by-products segment: 562 702 1,228 5,846
Derivative Financial Instruments, Assets [Member]        
Segment Reporting Information [Line Items]        
Sales of products, ethanol and by-products segment: (777)   (1,075)  
Other Segments [Member]        
Segment Reporting Information [Line Items]        
Sales of products, ethanol and by-products segment: $ 5 $ 26 $ 94 $ 125
[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.