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QUARTERLY UNAUDITED INFORMATION (Details) - Schedule of Quarterly Financial Information - USD ($)
$ / shares in Units, $ 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
Schedule of Quarterly Financial Information [Abstract]                      
Net sales and revenue $ 120,920 $ 86,671 $ 105,868 $ 104,575 $ 113,344 $ 123,750 $ 128,757 $ 120,820 $ 418,034 $ 486,671 $ 452,586
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
Net income (loss) 6,249 (1,673) 3,353 3,715 2,899 13,769 10,490 10,352 11,644 37,510 44,912
Net income (loss) attributable to REX common shareholders $ 4,402 $ (2,052) $ 2,256 $ 2,821 $ 1,057 $ 11,875 $ 9,217 $ 9,496 $ 7,427 $ 31,645 $ 39,706
Basic and diluted net income (loss) per share attributable to REX common shareholders (in Dollars per share) $ 700 [1] $ (320) [1] $ 360 [1] $ 450 [1] $ 170 $ 1,860 $ 1,430 $ 1,450 $ 1.18 $ 4.91 $ 6.02
[1] The total of the quarterly net income per share amounts do not equal the annual net income per share amounts due to the impact of varying amounts of shares outstanding during the year.