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Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	Oct. 31, 2011	Apr. 30, 2011
Consolidated Balance Sheets [Abstract]
Allowance for doubtful accounts	$ 11,032	$ 9,977
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	150,000	150,000
Common stock, shares issued	59,846	59,101
Common stock, shares outstanding	47,756	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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