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Liberty Investment (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
6 Months Ended
Oct. 29, 2011
Aug. 29, 2011
Aug. 18, 2011
Subsidiary, Sale of Stock [Line Items]      
Conversion rate of preferred stock 150.00%    
Number of consecutive trading days applicable to the conversion of preferred stock 20    
Legal and accounting fees $ 12,580    
Private Placement [Member]
     
Subsidiary, Sale of Stock [Line Items]      
Preferred stock issued, shares     204,000
Preferred stock, par value per share     $ 0.001
Preferred stock issued, aggregate value     $ 204,000
Percentage representation of common stock outstanding upon conversion   16.60%  
Preferred stock, initial conversion price $ 17.00    
Preferred stock, dividend rate, percentage 7.75%