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
	Apr. 25, 2023	May 31, 2023	Feb. 28, 2023	May 31, 2022	Feb. 28, 2022	May 31, 2023	Nov. 30, 2022
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		$ 35	$ 4
Share capital
Class of Stock [Line Items]
Beginning balance, Number of shares			146,225,035			146,225,035
Beginning balance, Ascribed value			$ 182,178			$ 182,178
Exercise of options, Number of shares				276,961	31,674
Private Placement, net of share issue cost, Number of shares	5,854,545	5,854,545				5,854,545
Private Placement, net of share issue cost, Ascribed value		$ 3,115				$ 3,115
Restricted share units, Number of shares		213,463	2,346,366	110,000	391,332	2,559,829
Restricted share units, Ascribed value						$ 1,659
Deferred share units, Number of shares						415,056
Deferred share units, Ascribed value						$ 468
Services settled by common shares, Number of shares		63,533	7,793			71,326
Services settled by common shares, Ascribed value		$ 35	$ 4			$ 39
Joint venture equity contribution (note 4(b)), Number of shares			143,505		31,469	143,505
Joint venture equity contribution (note 4(b)), Ascribed value		$ 111				$ 111
Ending balance, Number of shares outstanding		155,269,296				155,269,296	146,225,035
Ending balance, Ascribed value		$ 187,570				$ 187,570	$ 182,178