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Segment Reporting (Details) - Schedule Of Segment Results And Assets - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jul. 31, 2020
Jul. 31, 2019
Jul. 31, 2020
Jul. 31, 2019
Segment Reporting Information [Line Items]        
Net sales and revenue: $ 39,327 $ 105,868 $ 122,577 $ 210,443
Segment gross (loss) profit: (1,331) 4,004 (10,661) 7,650
(Loss) income before income taxes: (6,079) 731 (19,822) 898
Benefit (provision) for income taxes: 4,046 2,622 9,359 6,170
Segment (loss) profit (net of noncontrolling interests): (1,748) 2,256 (9,383) 5,077
Sales of products, ethanol and by-products segment: 39,242 105,770 122,477 210,223
Ethanol [Member]        
Segment Reporting Information [Line Items]        
Net sales and revenue: 39,242 105,770 122,477 210,223
Segment gross (loss) profit: 553 6,169 (7,670) 12,284
(Loss) income before income taxes: (3,259) 3,111 (15,610) 6,313
Benefit (provision) for income taxes: 893 (619) 5,054 (1,105)
Segment (loss) profit (net of noncontrolling interests): (2,178) 1,305 (9,611) 3,014
Sales of products, ethanol and by-products segment: 32,524 83,219 93,121 160,837
Refined Coal [Member]        
Segment Reporting Information [Line Items]        
Net sales and revenue: 85 [1] 98 [1] 100 220
Segment gross (loss) profit: (1,884) (2,165) (2,991) (4,634)
(Loss) income before income taxes: (2,118) (2,028) (2,965) (4,703)
Benefit (provision) for income taxes: 2,919 3,155 3,878 7,101
Segment (loss) profit (net of noncontrolling interests): 898 1,216 1,048 2,602
Sales of products, ethanol and by-products segment: 85 98 100 220
Corporate and Other [Member]        
Segment Reporting Information [Line Items]        
(Loss) income before income taxes: (702) (352) (1,247) (712)
Benefit (provision) for income taxes: 234 86 427 174
Segment (loss) profit (net of noncontrolling interests): (468) (265) (820) (539)
Dried Distillers Grains [Member]        
Segment Reporting Information [Line Items]        
Sales of products, ethanol and by-products segment: 5,480 15,887 24,398 34,561
Non-Food Grade Corn Oil [Member]        
Segment Reporting Information [Line Items]        
Sales of products, ethanol and by-products segment: 1,313 4,599 4,501 9,582
Modified Distillers Grains [Member]        
Segment Reporting Information [Line Items]        
Sales of products, ethanol and by-products segment: 209 2,004 666 5,144
Derivative Financial Instruments, Assets [Member]        
Segment Reporting Information [Line Items]        
Sales of products, ethanol and by-products segment: (298)   (298)  
Other Segments [Member]        
Segment Reporting Information [Line Items]        
Sales of products, ethanol and by-products segment: $ 14 $ 61 $ 89 $ 99
[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.