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Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Per Share data	Jul. 31, 2011	Apr. 30, 2011
Consolidated Balance Sheets
Allowance for doubtful accounts	$ 10,853	$ 9,977
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	150,000	150,000
Common stock, shares issued	59,789	59,101
Common stock, shares outstanding	47,720	47,003

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A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible.

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Face amount or stated value of common stock per share; generally not indicative of the fair market value per share.

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