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QUARTERLY UNAUDITED INFORMATION (Tables) | 12 Months Ended
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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.

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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=84173487&loc=d3e1280-108306 + Details
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