Schedule of Allocation of Share Based Compensation Costs for Deferred Share Units (Details)	3 Months Ended
	Jul. 31, 2015 USD ($)
Common Stock Schedule Of Allocation Of Share Based Compensation Costs For Deferred Share Units 1	$ 0
Common Stock Schedule Of Allocation Of Share Based Compensation Costs For Deferred Share Units 2	1,667
Common Stock Schedule Of Allocation Of Share Based Compensation Costs For Deferred Share Units 3	1,633
Common Stock Schedule Of Allocation Of Share Based Compensation Costs For Deferred Share Units 4	2,082
Common Stock Schedule Of Allocation Of Share Based Compensation Costs For Deferred Share Units 5	202,819
Common Stock Schedule Of Allocation Of Share Based Compensation Costs For Deferred Share Units 6	208,762
Common Stock Schedule Of Allocation Of Share Based Compensation Costs For Deferred Share Units 7	204,452
Common Stock Schedule Of Allocation Of Share Based Compensation Costs For Deferred Share Units 8	$ 212,511