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, 2025	Feb. 28, 2025	May 31, 2024	Feb. 29, 2024	May 31, 2025	Nov. 30, 2024
Share capital
Unlimited common shares authorized					Unlimited	Unlimited
Common Stock, No Par Value	$ 0				$ 0	$ 0
Exercise of options, Number of shares				0	350,000
Exercise of options, Ascribed value	$ 71	$ 131
Services settled by common shares, Ascribed value	$ 20	$ 30	$ 30	$ 30
Share capital
Share capital
Beginning balance, Number of shares		161,085,313			161,085,313
Beginning balance, Ascribed value		$ 190,503			$ 190,503
Exercise of options, Number of shares	86,667	263,333			350,000
Exercise of options, Ascribed value	$ 110	$ 195			$ 305
Restricted share units, Number of shares	119,906	2,647,945	353,347	3,633,065	2,767,851
Restricted share units, Ascribed value					$ 2,008
Services settled by common shares, Number of shares	13,986	24,260	66,511	64,368	38,246
Services settled by common shares, Ascribed value	$ 20	$ 30	$ 30	$ 30	$ 50
Ending balance, Number of shares outstanding	164,241,410				164,241,410	161,085,313
Ending balance, Ascribed value	$ 192,866				$ 192,866	$ 190,503