Earnings per share - Summary of Earnings Per Share (Parenthetical) (Detail) - shares	12 Months Ended
Oct. 31, 2022	Oct. 31, 2021
Dilutive potential shares from stock options [Member]
Earnings per share [line items]
Outstanding options excluded from calculation of diluted earnings per share	0	0

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

No definition available.

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration