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Segment Reporting (Tables) | 6 Months Ended
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Jul. 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 July 31, |  |  | Six Months Ended July 31, |
|  | 2014 |  |  | 2013 |  |  | 2014 |  |  | 2013 |
Net sales and revenue: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Alternative energy |  | $ | 150,133 |  |  | $ | 175,290 |  |  | $ | 305,960 |  |  | $ | 353,614 |
Real estate |  |  | 98 |  |  |  | 99 |  |  |  | 207 |  |  |  | 199 |
Total net sales and revenues |  | $ | 150,231 |  |  | $ | 175,389 |  |  | $ | 306,167 |  |  | $ | 353,813 |
Segment gross profit (loss): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Alternative energy |  | $ | 38,820 |  |  | $ | 10,890 |  |  | $ | 75,434 |  |  | $ | 19,916 |
Real estate |  |  | (2 | ) |  |  | (12 | ) |  |  | 9 |  |  |  | (40 | )
Total gross profit |  | $ | 38,818 |  |  | $ | 10,878 |  |  | $ | 75,443 |  |  | $ | 19,876 |
Segment profit (loss): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Alternative energy |  | $ | 41,509 |  |  | $ | 11,114 |  |  | $ | 80,385 |  |  | $ | 17,740 |
Real estate |  |  | (28 | ) |  |  | (74 | ) |  |  | (44 | ) |  |  | (163 | )
Corporate expense, net |  |  | (761 | ) |  |  | (722 | ) |  |  | (1,514 | ) |  |  | (1,413 | )
Income from continuing operations before income taxes and noncontrolling interests |  | $ | 40,720 |  |  | $ | 10,318 |  |  | $ | 78,827 |  |  | $ | 16,164 |
Schedule of Segment Reporting Information Assets [Table Text Block] |
|  | July 31, 2014 |  |  | January 31, 2014 |
Assets: |  |  |  |  |  |  |  |
Alternative energy |  | $ | 413,883 |  |  | $ | 356,589 |
Real estate |  |  | 4,141 |  |  |  | 4,722 |
Corporate |  |  | 51,496 |  |  |  | 66,557 |
Total assets |  | $ | 469,520 |  |  | $ | 427,868 |

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- Definition Tabular disclosure of segment reporting information assets. + References No definition available. + Details
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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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