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QUARTERLY UNAUDITED INFORMATION (Tables)
 12 Months Ended
Jan. 31, 2018
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, 
   2017   2017   2017   2018 
                 
Net sales and revenue  $113,143   $108,744   $121,164   $109,535 
Gross profit   12,489    10,781    14,867    6,024 
Net income   5,612    4,171    14,994    20,135 
Net income attributable to REX common shareholders   4,544    2,941    13,168    19,053 
Basic and diluted net income per share attributable to REX common shareholders (a)  $0.69   $0.45   $2.00   $2.89 
     
   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 and diluted net income per share attributable to REX common shareholders  $0.43   $1.24   $1.36   $1.88 
  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.