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Variable Interest Entities (Details) (USD $)
Jul. 31, 2012
Jan. 31, 2012
Jul. 31, 2011
Jan. 31, 2011
Condensed consolidated balance sheets related to VIEs        
Cash and cash equivalents $ 186,834,000 $ 156,524,000 $ 106,890,000 $ 83,292,000
TOTAL ASSETS 245,463,000 205,252,000 145,626,000  
Accounts payable 44,579,000 29,524,000    
Accrued Liabilities 8,180,000 6,751,000    
TOTAL LIABILITIES 133,049,000 104,289,000    
Variable Interest Entity, Primary Beneficiary [Member]
        
Condensed consolidated balance sheets related to VIEs        
Cash and cash equivalents 149,000 75,000    
Construction project costs 2,985,000 1,469,000    
TOTAL ASSETS 3,134,000 1,544,000    
Accounts payable 150,000 27,000    
Accrued Liabilities 526,000 224,000    
TOTAL LIABILITIES $ 676,000 $ 251,000