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Share capital - Option Valuation Assumptions (Details)	9 Months Ended
	Jun. 30, 2025 $ / shares
Share capital
Fair value per share of stock options granted	$ 3.4
Employee Stock Option
Share capital
Share price at grant date	$ 3.4
Risk-free interest rate	4.25%
Expected volatility	242.40%
Expected life of option	10 years
Expected dividend yield	0.00%
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- Definition

The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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- Definition

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Indicates method used to estimate fair value of award under share-based payment arrangement. Includes, but is not limited to, Black-Scholes-Merton, Monte Carlo, and Binomial models.

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Price of a single share of a number of saleable stocks of a company.

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Expected term of 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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