Common Stock - Schedule of Employee and Non-Employee Service Share-based Compensation Allocation of Recognized Period Costs (Details) - USD ($)	3 Months Ended		6 Months Ended
	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2020	Oct. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense	$ 39,288	$ 36,785	$ 80,608	$ 84,800
Cost of sales [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense	8,196	7,779	16,472	19,000
Sales and marketing [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense	13,003	12,394	26,113	28,117
Research and development [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense	8,897	6,682	17,922	16,985
General and administrative [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense	$ 9,192	$ 9,930	$ 20,101	$ 20,698

COUNTERPATH CORP 10-Q