CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)	Jan. 31, 2013	Apr. 30, 2012
Redeemable common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Redeemable common stock, shares outstanding	31,133,333	12,533,333
Preferred stock, par value (in dollars per share)	$ 10	$ 10
Preferred stock, shares authorized	56,075	56,075
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized	125,000,000	125,000,000
Common stock, shares issued	38,855,003	37,740,345
Common stock, shares outstanding	35,618,767	34,529,000
Treasury stock, shares	3,236,000	3,236,000