CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)	Apr. 30, 2014	Apr. 30, 2013
Redeemable common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Redeemable common stock, contingently puttable common shares outstanding	0	31,133,333
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized, including redeemable common stock	125,000,000	125,000,000
Common stock, shares issued	70,121,741	38,855,003
Common stock, shares outstanding	66,885,741	35,643,658
Treasury stock, common shares	3,236,000	3,236,000