Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Jul. 31, 2014	Apr. 30, 2014
Allowance for doubtful accounts	$ 2,432	$ 2,324
Common stock, par value	$ 0.0001	$ 0.0001
Common stock, shares authorized	150,000,000	150,000,000
Common stock, shares issued	78,271,861	77,887,663
Common stock, shares outstanding	78,021,861	77,637,663
Treasury stock, shares	250,000	250,000