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NET INCOME PER SHARE FROM CONTINUING OPERATIONS (Details) - Schedule of Earnings Per Share, Basic and Diluted (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Jan. 31, 2014
Jan. 31, 2013
Jan. 31, 2012
Schedule of Earnings Per Share, Basic and Diluted [Abstract]      
Basic net income per share from continuing operations attributable to REX common shareholders (in Dollars) $ 33,919   $ 27,129
Basic net income per share from continuing operations attributable to REX common shareholders 8,137 8,272 9,117
Basic net income per share from continuing operations attributable to REX common shareholders (in Dollars per share) $ 4.17 $ (0.35) $ 2.97
Effect of stock options 43   70
Diluted net income per share from continuing operations attributable to REX common shareholders (in Dollars) $ 33,919   $ 27,129
Diluted net income per share from continuing operations attributable to REX common shareholders 8,180 8,272 9,187
Diluted net income per share from continuing operations attributable to REX common shareholders (in Dollars per share) $ 4.15 $ (0.35) $ 2.95