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Stock-based compensation and equity transactions - Summary of fair value of employee and non-employee directors' stock options (Detail)	6 Months Ended
	Apr. 30, 2019	Apr. 30, 2018
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Risk-free interest rate	2.88%	1.87%
Dividend yield	0.98%	3.28%
Expected life of the option	5 years 11 months 15 days	4 years 6 months 14 days
Volatility factor	55.25%	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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- Definition

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

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- 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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- Definition

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

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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