Quarterly report pursuant to Section 13 or 15(d)

Consolidated Balance Sheets (Parenthetical)

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Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Per Share data, unless otherwise specified
Jan. 31, 2012
Apr. 30, 2011
Consolidated Balance Sheets [Abstract]    
Allowance for doubtful accounts $ 11,023 $ 9,977
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 150,000 150,000
Common stock, shares issued 59,864 59,101
Common stock, shares outstanding 47,784 47,003