STOCK-BASED COMPENSATION - Weighted-average fair value (Details)	12 Months Ended
Sep. 30, 2021	Sep. 30, 2020
STOCK-BASED COMPENSATION
Risk-free interest rate	0.93%	1.36%
Volatility of the expected market price of the Company's common shares	70.30%	76.56%
Expected life of the options (years)	5 years 11 months 12 days	5 years 11 months 12 days

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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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- Definition

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

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- Definition

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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