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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, 2017
Oct. 31, 2016
Jul. 31, 2016
Apr. 30, 2016
Jan. 31, 2016
Oct. 31, 2015
Jul. 31, 2015
Apr. 30, 2015
Jan. 31, 2017
Jan. 31, 2016
Jan. 31, 2015
Schedule of Quarterly Financial Information [Abstract]                      
Net sales and revenue $ 121,587 $ 116,283 $ 115,707 $ 100,222 $ 107,227 $ 110,584 $ 113,480 $ 105,197 $ 453,799 $ 436,488 $ 572,230
Gross profit 25,171 20,162 17,284 8,422 9,158 14,273 18,276 9,127 71,039 50,834 141,939
Net income 15,549 11,474 9,029 3,466 4,827 9,433 18,711 4,439 39,518 37,410 103,714
Net income attributable to REX common shareholders $ 12,381 $ 8,938 $ 8,176 $ 2,838 $ 3,686 $ 7,456 $ 16,367 $ 3,927 $ 32,333 $ 31,436 $ 87,337
Basic net income per share attributable to REX common shareholders (in Dollars per share) $ 1.88 $ 1.36 $ 1.24 $ 0.43 $ 0.54 [1] $ 1.08 [1] $ 2.16 [1] $ 0.50 [1] $ 4.91 $ 4.31 $ 10.77
Diluted net income per share attributable to REX common shareholders (in Dollars per share) $ 1.88 $ 1.36 $ 1.24 $ 0.43 $ 0.54 [1] $ 1.08 [1] $ 2.16 [1] $ 0.50 [1] $ 4.91 $ 4.30 $ 10.76
[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.