Schedule of Long Lived Assets by Geographical Areas (Details) (USD $)	6 Months Ended
	Oct. 31, 2012
Segmented Information Schedule Of Long Lived Assets By Geographical Areas 1	$ 8,960,709
Segmented Information Schedule Of Long Lived Assets By Geographical Areas 2	9,117,687
Segmented Information Schedule Of Long Lived Assets By Geographical Areas 3	159,905
Segmented Information Schedule Of Long Lived Assets By Geographical Areas 4	24,569
Segmented Information Schedule Of Long Lived Assets By Geographical Areas 5	9,120,614
Segmented Information Schedule Of Long Lived Assets By Geographical Areas 6	$ 9,142,256