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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

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