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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, 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
Schedule of Quarterly Financial Information [Abstract]                      
Net sales and revenue $ 109,535 $ 121,164 $ 108,744 $ 113,143 $ 121,587 $ 116,283 $ 115,707 $ 100,222 $ 452,586 $ 453,799 $ 436,488
Gross profit 6,024 14,867 10,781 12,489 25,171 20,162 17,284 8,422 44,161 71,039 50,834
Net income 20,135 14,994 4,171 5,612 15,549 11,474 9,029 3,466 44,912 39,518 37,410
Net income attributable to REX common shareholders $ 19,053 $ 13,168 $ 2,941 $ 4,544 $ 12,381 $ 8,938 $ 8,176 $ 2,838 $ 39,706 $ 32,333 $ 31,436
Basic and diluted net income per share attributable to REX common shareholders (in Dollars per share) $ 2.89 [1] $ 2.00 [1] $ 0.45 [1] $ 0.69 [1] $ 1.88 $ 1.36 $ 1.24 $ 0.43      
[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.