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SEGMENT REPORTING (Details) - Schedule Of Segment Results And Assets - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Jan. 31, 2018
Oct. 31, 2017
Jul. 31, 2017
Apr. 30, 2017
Jan. 31, 2017
Oct. 31, 2016
Jul. 31, 2016
Apr. 30, 2016
Jan. 31, 2018
Jan. 31, 2017
Jan. 31, 2016
Segment Reporting Information [Line Items]                      
Net sales and revenue:                 $ 452,586 $ 453,799 $ 436,488
Segment gross profit (loss): $ 6,024 $ 14,867 $ 10,781 $ 12,489 $ 25,171 $ 20,162 $ 17,284 $ 8,422 44,161 71,039 50,834
Income (loss) before income taxes:                 25,393 56,911 51,518
Benefit (provision) for income taxes:                 19,519 (17,393) (14,108)
Segment profit (loss):                 39,706 32,333 31,436
Sales of products                 452,153 453,799 436,488
Interest income:                 1,556 434 381
Depreciation expense:                 21,462 19,519 18,638
Equity in income of unconsolidated affiliates:                 3,232 6,144 8,984
(Loss) gain on sale of investment:                 (13) 192 10,385
Ethanol [Member]                      
Segment Reporting Information [Line Items]                      
Net sales and revenue:                 452,153 453,799 436,488
Segment gross profit (loss):                 51,509 71,039 50,834
Income (loss) before income taxes:                 38,352 59,447 53,469
Benefit (provision) for income taxes:                 3,245 (18,259) (14,690)
Segment profit (loss):                 35,880 33,950 32,734
Sales of products                 359,239 358,349 333,200
Interest income:                 878 212 176
Depreciation expense:                 20,037 19,464 18,559
Equity in income of unconsolidated affiliates:                 3,232 6,144 8,984
(Loss) gain on sale of investment:                 (13) 192 10,385
Refined Coal [Member]                      
Segment Reporting Information [Line Items]                      
Net sales and revenue: [1]                 433
Segment gross profit (loss):                 (7,348)    
Income (loss) before income taxes:                 (10,021)    
Benefit (provision) for income taxes:                 15,168    
Segment profit (loss):                 5,628    
Sales of products                 433    
Depreciation expense:                 1,385    
Corporate and Other [Member]                      
Segment Reporting Information [Line Items]                      
Income (loss) before income taxes:                 (2,938) (2,536) (1,951)
Benefit (provision) for income taxes:                 1,106 866 582
Segment profit (loss):                 (1,802) (1,617) (1,298)
Interest income:                 678 222 205
Depreciation expense:                 40 55 79
Dried Distillers Grains [Member]                      
Segment Reporting Information [Line Items]                      
Sales of products                 63,120 71,204 81,116
Non-Food Grade Corn Oil [Member]                      
Segment Reporting Information [Line Items]                      
Sales of products                 21,195 18,518 15,510
Modified Distillers Grains [Member]                      
Segment Reporting Information [Line Items]                      
Sales of products                 8,525 5,326 5,999
Other Segments [Member]                      
Segment Reporting Information [Line Items]                      
Sales of products                 $ 74 $ 402 $ 663
[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.