CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Apr. 30, 2013	Apr. 30, 2012
Allowance for doubtful accounts	$ 2,668	$ 788
Common stock, par value	$ 0.0001	$ 0.0001
Common stock, shares authorized	150,000,000	150,000,000
Common stock, shares issued	73,925,136	58,779,937
Common stock, shares outstanding	73,675,136	58,529,937
Treasury stock, shares	250,000	250,000