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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	Apr. 30, 2012	Apr. 30, 2011
Allowance for doubtful accounts	$ 9,437	$ 9,977
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	150,000	150,000
Common stock, shares issued	59,975	59,101
Common stock, shares outstanding	47,913	47,003

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