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Segment Reporting (Details) - Schedule Of Segment Results And Assets - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Jan. 31, 2020
Oct. 31, 2019
Jul. 31, 2019
Apr. 30, 2019
Jan. 31, 2019
Oct. 31, 2018
Jul. 31, 2018
Apr. 30, 2018
Jan. 31, 2020
Jan. 31, 2019
Jan. 31, 2018
Net sales and revenue:                      
Net sales and revenue:                 $ 418,034 $ 486,671 $ 452,586
Segment gross profit (loss):                      
Segment gross profit (loss): $ 6,593 $ (1,758) $ 4,004 $ 3,646 $ 2,218 $ 7,747 $ 9,399 $ 10,851 12,485 30,215 44,161
(Loss) income before income taxes:                      
(Loss) income before income taxes:                 (1,169) 14,588 25,393
Benefit (provision) for income taxes:                      
Benefit (provision) for income taxes:                 12,813 22,922 19,519
Segment profit (loss):                      
Segment profit (loss):                 7,427 31,645 39,706
Sales of products, ethanol and by-products segment:                      
Sales of products, ethanol and by-products segment:                 417,700 485,885 452,153
Interest income:                      
Interest income:                 4,120 3,514 1,556
Depreciation expense:                      
Depreciation expense:                 23,007 24,828 21,462
Equity in income of unconsolidated affiliates:                      
Equity in income of unconsolidated affiliates:                 1,392 1,536 3,232
Ethanol [Member]                      
Net sales and revenue:                      
Net sales and revenue:                 417,700 485,885 452,153
Segment gross profit (loss):                      
Segment gross profit (loss):                 20,402 43,856 51,509
(Loss) income before income taxes:                      
(Loss) income before income taxes:                 8,469 31,545 38,352
Benefit (provision) for income taxes:                      
Benefit (provision) for income taxes:                 1,528 (2,343) 3,245
Segment profit (loss):                      
Segment profit (loss):                 5,439 23,346 35,880
Sales of products, ethanol and by-products segment:                      
Sales of products, ethanol and by-products segment:                 321,434 368,319 359,239
Interest income:                      
Interest income:                 2,949 2,460 878
Depreciation expense:                      
Depreciation expense:                 20,182 22,004 20,037
Equity in income of unconsolidated affiliates:                      
Equity in income of unconsolidated affiliates:                 1,392 1,536 3,232
Refined Coal [Member]                      
Net sales and revenue:                      
Net sales and revenue: [1]                 334 786 433
Segment gross profit (loss):                      
Segment gross profit (loss):                 (7,917) (13,641) (7,348)
(Loss) income before income taxes:                      
(Loss) income before income taxes:                 (7,778) (15,204) (10,021)
Benefit (provision) for income taxes:                      
Benefit (provision) for income taxes:                 10,828 24,674 15,168
Segment profit (loss):                      
Segment profit (loss):                 3,391 10,148 5,628
Sales of products, ethanol and by-products segment:                      
Sales of products, ethanol and by-products segment:                 334 786 433
Depreciation expense:                      
Depreciation expense:                 2,790 2,784 1,385
Corporate and Other [Member]                      
(Loss) income before income taxes:                      
(Loss) income before income taxes:                 (1,860) (1,753) (2,938)
Benefit (provision) for income taxes:                      
Benefit (provision) for income taxes:                 457 591 1,106
Segment profit (loss):                      
Segment profit (loss):                 (1,403) (1,849) (1,802)
Interest income:                      
Interest income:                 1,171 1,054 678
Depreciation expense:                      
Depreciation expense:                 35 40 40
Dried Distillers Grains [Member]                      
Sales of products, ethanol and by-products segment:                      
Sales of products, ethanol and by-products segment:                 71,755 85,417 63,120
Non-Food Grade Corn Oil [Member]                      
Sales of products, ethanol and by-products segment:                      
Sales of products, ethanol and by-products segment:                 17,135 20,097 21,195
Modified Distillers Grains [Member]                      
Sales of products, ethanol and by-products segment:                      
Sales of products, ethanol and by-products segment:                 7,240 11,950 8,525
Other Segments [Member]                      
Sales of products, ethanol and by-products segment:                      
Sales of products, ethanol and by-products segment:                 $ 136 $ 102 $ 74
[1] Sales in the refined coal segment are recorded net of the cost of coal as the Company purchases the coal feedstock from the customer to which refined coal is sold.