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Amount of Shares of Common Stock Reserved (Detail)
 12 Months Ended
Jan. 31, 2013
Jan. 31, 2012
Jan. 31, 2011
Stock Option Outstanding [Line Items]      
Common stock issued and outstanding 34,843,441    
Warrants 2,936,000 1,500,000 1,655,333
Stock options outstanding 5,300,000 1,150,000 0
Common stock reserved for future issuance 56,763,202    
10% Senior Subordinated Convertible Notes due January 31, 2013
      
Stock Option Outstanding [Line Items]      
Conversion of Notes 10,883,761    
8% Senior Subordinated Convertible Notes due February 1, 2015
      
Stock Option Outstanding [Line Items]      
Conversion of Notes 600,000    
9% Senior Subordinated Callable Notes
      
Stock Option Outstanding [Line Items]      
Conversion of Notes 2,200,000