Schedule of Disclosure of Share-based Compensation Arrangements by Share-based Payment Award (Details)	3 Months Ended
	Jul. 31, 2012
Stock Options Schedule Of Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 1	2,000,000
Stock Options Schedule Of Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 2	0.15
Stock Options Schedule Of Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 3	275,000
Stock Options Schedule Of Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 4	0.5
Stock Options Schedule Of Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 5	350,000
Stock Options Schedule Of Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 6	1
Stock Options Schedule Of Disclosure Of Share-based Compensation Arrangements By Share-based Payment Award 7	2,625,000