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NET INCOME PER SHARE FROM CONTINUING OPERATIONS (Details) - Schedule of Earnings Per Share, Basic and Diluted - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Jan. 31, 2017
Jan. 31, 2016
Jan. 31, 2015
Schedule of Earnings Per Share, Basic and Diluted [Abstract]      
Basic net income per share from continuing operations attributable to REX common shareholders (in Dollars)   $ 31,436 $ 86,776
Basic net income per share from continuing operations attributable to REX common shareholders 6,587 7,297 8,109
Basic net income per share from continuing operations attributable to REX common shareholders (in Dollars per share) $ 4.91 $ 4.31 $ 10.70
Effect of restricted stock   10 9
Diluted net income per share from continuing operations attributable to REX common shareholders (in Dollars)   $ 31,436 $ 86,776
Diluted net income per share from continuing operations attributable to REX common shareholders 6,587 7,307 8,118
Diluted net income per share from continuing operations attributable to REX common shareholders (in Dollars per share) $ 4.91 $ 4.30 $ 10.69