Share-based payments - Option grants outstanding (Details)	9 Months Ended	12 Months Ended
May 31, 2025 shares $ / shares	Aug. 31, 2024 shares $ / shares
Share-based payments
Number of options, Beginning balance \| shares	810	843
Number of options, Granted \| shares		76
Number of options, Forfeited \| shares		(109)
Number of options, Expired \| shares	(450)
Number of options, Ending balance \| shares	360	810
Weighted average exercise price, Beginning balance (in dollars per share) \| $ / shares	$ 6,562.77	$ 7,027.44
Weighted average exercise price, Granted (in dollars per share) \| $ / shares		3,745.49
Weighted average exercise price, Forfeited (in dollars per share) \| $ / shares		8,198.46
Weighted average exercise price, Expired (in dollars per share) \| $ / shares	5,968.65
Weighted average exercise price, Ending balance (in dollars per share) \| $ / shares	$ 7,935.98	$ 6,562.77

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The number of share options outstanding in a share-based payment arrangement.

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