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Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Oct. 31, 2013
Apr. 30, 2013
Restricted cash   $ 3,345
Allowance for doubtful accounts receivable $ 1,166 $ 1,128
Preferred stock, par value $ 0.001 $ 0.001
Preferred stock, shares authorized 20,000,000 20,000,000
Preferred stock, shares issued      
Preferred stock, shares outstanding      
Common stock, par value $ 0.001 $ 0.001
Common stock, shares authorized 100,000,000 100,000,000
Common stock, shares issued 68,244,648 67,596,716
Common stock, shares outstanding 55,930,917 64,297,113
Treasury stock, shares 12,313,731 3,299,603