Share-based Compensation - Schedule of Assumptions Used for Estimating the Fair Value of Options (Detail) - Options [member]	6 Months Ended
Apr. 30, 2020 yr $ / shares	Apr. 30, 2019 yr $ / shares
Disclosure of terms and conditions of share-based payment arrangement [line items]
Risk-free interest rate	1.59%	2.03%
Expected option life, years \| yr	6.3	6.3
Expected volatility	12.90%	12.64%
Expected dividend yield	3.50%	3.48%
Exercise price/share price \| $ / shares	$ 72.84	$ 69.39

The expected volatility of the share price used to calculate the fair value of the share options granted. Expected volatility is a measure of the amount by which a price is expected to fluctuate during a period. The measure of volatility used in option pricing models is the annualised standard deviation of the continuously compounded rates of return on the share over a period of time.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2019-01-01
-Paragraph 47
-Subparagraph a
-Clause i
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-URIDate 2019-03-27

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- Definition

The implied yield currently available on zero-coupon government issues of the country in whose currency the exercise price for share options granted is expressed, with a remaining term equal to the expected term of the option being valued (based on the option's remaining contractual life and taking into account the effects of expected early exercise). [Refer: Government [member]]

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- Definition

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

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- Definition

The exercise price of share options granted.

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- Definition

The percentage of an expected dividend used to calculate the fair value of share options granted.

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- Definition

Expected life share options granted.

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