Annual report pursuant to Section 13 and 15(d)

Consolidated Balance Sheets (Parenthetical)

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Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Per Share data
Apr. 30, 2011
Apr. 30, 2010
ASSETS    
Allowance for doubtful accounts $ 9,977 $ 5,983
Stockholders' equity:    
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 150,000 150,000
Common stock, shares issued 59,101 57,614
Common stock, shares outstanding 47,003 45,979