Schedule of Share Purchase Warrants Activity (Details)	3 Months Ended
	Jul. 31, 2012
Share Purchase Warrants Schedule Of Stockholders' Equity Note, Warrants Or Rights 1	1,300,000
Share Purchase Warrants Schedule Of Stockholders' Equity Note, Warrants Or Rights 2	0.5
Share Purchase Warrants Schedule Of Stockholders' Equity Note, Warrants Or Rights 3	156,000
Share Purchase Warrants Schedule Of Stockholders' Equity Note, Warrants Or Rights 4	0.5
Share Purchase Warrants Schedule Of Stockholders' Equity Note, Warrants Or Rights 5	1,456,000