Subsequent events (Narrative) (Details)	1 Months Ended			12 Months Ended
	Jul. 26, 2021 CAD ($) shares	Jul. 26, 2021 USD ($) shares	Aug. 23, 2019 shares	May 31, 2021 CAD ($) shares	May 31, 2021 USD ($) shares	May 31, 2020 USD ($)
Subsequent Event [Line Items]
Proceeds from issuance of private placement | $					$ 44,703	$ 113,112
Private Placement [Member]
Subsequent Event [Line Items]
Number of common stock shares issued			5,000,000
Proceeds from issuance of private placement | $					3,750
Private Placement - 2 [Member]
Subsequent Event [Line Items]
Proceeds from issuance of private placement				$ 50,000	40,953
Subsequent Event [Member] | Private Placement [Member]
Subsequent Event [Line Items]
Number of common stock shares issued	3,000,000	3,000,000
Proceeds from issuance of private placement | $		$ 5,625
Subscription received for issuance of common shares				$ 32,500	$ 25,715
Number of shares issued for subscription received				13,000,000	13,000,000
Subsequent Event [Member] | Private Placement - 2 [Member]
Subsequent Event [Line Items]
Number of common stock shares issued	37,000,000	37,000,000
Proceeds from issuance of private placement	$ 92,500	$ 75,295
Subscription received for issuance of common shares | $					$ 18,750
Number of shares issued for subscription received				10,000,000	10,000,000