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Share capital - Stock-based compensation expense (Details) - USD ($)	3 Months Ended		9 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Share capital
Stock-based compensation expense	$ 2,120,000	$ 483,000	$ 2,625,000	$ 2,154,000
Compensation expense related to nonvested	4,490,000		$ 4,490,000
Weighted average vesting period			7 months 6 days
Restricted share units
Share capital
Stock-based compensation expense	1,809,000	322,000	$ 2,141,000	1,423,000
Employee Stock Option
Share capital
Stock-based compensation expense	$ 311,000	$ 161,000	$ 484,000	$ 731,000

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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