SHARE CAPITAL (Detail) - Summary Of Stock Options Outstanding	6 Months Ended
	Oct. 31, 2020 $ / shares shares
Exercisable	1,500,000
Set 1 [Member]
Type of Security	Stock options
Outstanding	300,000
Exercisable	300,000
Exercise Price (CAD$) | $ / shares	$ 0.30
Expiry Date	Jul. 21, 2021
Remaining Contractual Life (years)	262 days 19 hours 12 minutes
Set 2 [Member]
Type of Security	Stock options
Outstanding	1,000,000
Exercisable	1,000,000
Exercise Price (CAD$) | $ / shares	$ 0.25
Expiry Date	Apr. 20, 2022
Remaining Contractual Life (years)	1 year 171 days 13 hours 12 minutes
Set 3 [Member]
Type of Security	Stock options
Outstanding	1,450,000
Exercisable	200,000
Exercise Price (CAD$) | $ / shares	$ 0.25
Expiry Date	Aug. 09, 2023
Remaining Contractual Life (years)	2 years 281 days 1 hour 12 minutes