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QUARTERLY UNAUDITED INFORMATION (Tables)
 12 Months Ended
Jan. 31, 2017
Quarterly Financial Information Disclosure [Abstract]  
Quarterly Financial Information [Table Text Block] The following tables set forth the Company’s net sales and revenue, gross profit, net income and net income per share (basic and diluted) for each quarter during the last two fiscal years. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation have been included.

   Quarters Ended 
   (In Thousands, Except Per Share Amounts) 
   April 30,   July 31,   October 31,   January 31, 
   2016   2016   2016   2017 
                 
Net sales and revenue  $100,222   $115,707   $116,283   $121,587 
Gross profit   8,422    17,284    20,162    25,171 
Net income   3,466    9,029    11,474    15,549 
Net income attributable to REX common shareholders   2,838    8,176    8,938    12,381 
Basic net income per share attributable to REX common shareholders  $0.43   $1.24   $1.36   $1.88 
Diluted net income per share attributable to REX common shareholders  $0.43   $1.24   $1.36   $1.88 
   Quarters Ended 
   (In Thousands, Except Per Share Amounts) 
   April 30,   July 31,   October 31,   January 31, 
   2015   2015   2015   2016 
                 
Net sales and revenue  $105,197   $113,480   $110,584   $107,227 
Gross profit   9,127    18,276    14,273    9,158 
Net income   4,439    18,711    9,433    4,827 
Net income attributable to REX common shareholders   3,927    16,367    7,456    3,686 
Basic net income per share attributable to REX common shareholders (a)  $0.50   $2.16   $1.08   $0.54 
Diluted net income per share attributable to REX common shareholders (a)  $0.50   $2.16   $1.08   $0.54 
a)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.