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Variable Interest Entities (Details) (USD $) | Jan. 31, 2013 | Jan. 31, 2012 | Jan. 31, 2011
--- | --- | --- | ---
Condensed consolidated balance sheets related to VIEs |  |  |
Cash and cash equivalents | $ 175,142,000 | $ 156,524,000 | $ 83,292,000
Property, plant and equipment | 5,309,000 | 1,469,000 |
TOTAL ASSETS | 234,724,000 | 205,252,000 |
Accounts payable | 32,699,000 | 29,524,000 |
TOTAL LIABILITIES | 115,556,000 | 104,289,000 |
Variable Interest Entity, Primary Beneficiary [Member] |  |  |
Condensed consolidated balance sheets related to VIEs |  |  |
Cash and cash equivalents | 190,000 | 75,000 |
Property, plant and equipment | 5,309,000 | 1,469,000 |
TOTAL ASSETS | 5,499,000 | 1,544,000 |
Accounts payable | 334,000 | 27,000 |
Accrued expenses | 747,000 | 224,000 |
TOTAL LIABILITIES | $ 1,081,000 | $ 251,000 |

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