Schedule of Share-based Compensation, Stock Options, Activity (Details)	3 Months Ended
	Jul. 31, 2012
Stock Options Schedule Of Share-based Compensation, Stock Options, Activity 1	2,625,000
Stock Options Schedule Of Share-based Compensation, Stock Options, Activity 2	0.3
Stock Options Schedule Of Share-based Compensation, Stock Options, Activity 3	3.71
Stock Options Schedule Of Share-based Compensation, Stock Options, Activity 4	0