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Segment Reporting (Tables) | 9 Months Ended
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Oct. 31, 2014
Segment Reporting [Abstract] |
Schedule of Segment Reporting Information Profit Loss And Revenue Percentage [Table Text Block] | The following table summarizes segment and other results and assets (amounts in thousands):
|  | Three Months Ended October 31, |  |  | Nine Months Ended October 31, |
|  | 2014 |  |  | 2013 |  |  | 2014 |  |  | 2013 |
Net sales and revenue: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Alternative energy |  | $ | 138,363 |  |  | $ | 166,039 |  |  | $ | 444,323 |  |  | $ | 519,653 |
Real estate |  |  | 91 |  |  |  | 149 |  |  |  | 299 |  |  |  | 348 |
Total net sales and revenues |  | $ | 138,454 |  |  | $ | 166,188 |  |  | $ | 444,622 |  |  | $ | 520,001 |
Segment gross profit (loss): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Alternative energy |  | $ | 36,506 |  |  | $ | 18,002 |  |  | $ | 111,940 |  |  | $ | 37,918 |
Real estate |  |  | (9 | ) |  |  | 26 |  |  |  | 17 |  |  |  | 6 |
Total gross profit |  | $ | 36,497 |  |  | $ | 18,028 |  |  | $ | 111,957 |  |  | $ | 37,924 |
|  | Three Months Ended October 31, |  |  | Nine Months Ended October 31, |
|  | 2014 |  |  | 2013 |  |  | 2014 |  |  | 2013 |
Segment profit (loss): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Alternative energy |  | $ | 41,412 |  |  | $ | 16,491 |  |  | $ | 121,797 |  |  | $ | 34,231 |
Real estate |  |  | (34 | ) |  |  | (35 | ) |  |  | (63 | ) |  |  | (179 | )
Corporate expense, net |  |  | (801 | ) |  |  | (604 | ) |  |  | (2,319 | ) |  |  | (2,010 | )
Income from continuing operations before income taxes and noncontrolling interests |  | $ | 40,577 |  |  | $ | 15,852 |  |  | $ | 119,415 |  |  | $ | 32,042 |
Schedule of Segment Reporting Information Assets [Table Text Block] |
|  | October 31, 2014 |  |  | January 31, 2014 |
Assets: |  |  |  |  |  |  |  |
Alternative energy |  | $ | 416,703 |  |  | $ | 356,589 |
Real estate |  |  | 4,145 |  |  |  | 4,722 |
Corporate |  |  | 49,530 |  |  |  | 66,557 |
Total assets |  | $ | 470,378 |  |  | $ | 427,868 |

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- Definition Tabular disclosure of segment reporting information profit loss and revenue percentage. + References No definition available. + Details
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