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Stock-based compensation and equity transactions - Summary of fair value of employee and non-employee directors' stock options (Detail)	9 Months Ended
	Jul. 31, 2019	Jul. 31, 2018
Stock-based compensation and equity transactions
Risk-free interest rate	2.86%	1.87%
Dividend yield	0.98%	3.28%
Expected life of the option	5 years 10 months 24 days	4 years 6 months 15 days
Volatility factor	55.42%	46.83%

X

- Definition

Period the instruments, asset or liability is expected to be outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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X

- Definition

Risk-free interest rate assumption used in valuing an instruments.

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X

- Definition

Expected dividend to be paid to holders of the underlying shares or financial instruments (expressed as a percentage of the share or instrument's price).

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X

- Definition

Measure of dispersion, in percentage term (for instance, the standard deviation or variance), for a given stock price.

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- References

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