Share capital - Authorized unlimited common shares, no par value (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended	12 Months Ended
	May 31, 2024	Feb. 29, 2024	May 31, 2023	Feb. 28, 2023	May 31, 2024	Nov. 30, 2023
Class of Stock [Line Items]
Unlimited common shares authorized					Unlimited	Unlimited
Common Stock, No Par Value	$ 0				$ 0	$ 0
Private Placement, net of share issue cost, Ascribed value			$ 3,115
Services settled by common shares, Ascribed value	$ 30	$ 30	$ 35	$ 4
Number of shares, issued	160,186,788				160,186,788	155,269,296
Common Stock [Member]
Class of Stock [Line Items]
Private Placement, net of share issue cost, Number of shares			5,854,545
Private Placement, net of share issue cost, Ascribed value			$ 3,115
Restricted share units, Number of shares	353,347	3,633,065	213,463	2,346,366	3,986,412
Restricted share units, Ascribed value					$ 1,959
Services settled by common shares, Number of shares	66,511	64,368	63,533	7,793	130,879
Services settled by common shares, Ascribed value	$ 30	$ 30	$ 35	$ 4	$ 60
Joint venture equity contribution (note 3(a)), Number of shares		143,507		143,505	143,507
Joint venture equity contribution (note 3(a)), Ascribed value	$ 112				$ 112
Ending balance, Number of shares outstanding	160,186,788				160,186,788	155,925,990
Beginning balance, Number of shares		155,925,990			155,925,990
Ending balance, Ascribed value	$ 190,017				$ 190,017	$ 187,886
Beginning balance, Ascribed value		$ 187,886			$ 187,886