Employee benefits - Pension and other post-employment benefits - Sensitivity Analysis of Key Assumptions (Parenthetical) (Detail)	12 Months Ended
Oct. 31, 2022
Defined benefit pension plans [member] \| Impact of 100 bps in discount rate [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Percentage of reasonably possible increase in actuarial assumption	1.00%
Percentage of reasonably possible decrease in actuarial assumption	1.00%
Defined benefit pension plans [member] \| Impact of 50 bps in rate of increase in future compensation [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Percentage of reasonably possible increase in actuarial assumption	0.50%
Percentage of reasonably possible decrease in actuarial assumption	0.50%
Defined benefit pension plans [member] \| Impact of increase in longevity of one additional year [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Period of reasonably possible increase in actuarial assumption	1 year
Defined benefit pension plans [member] \| Impact of 100 bps in Healthcare cost trend rate [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Percentage of reasonably possible increase in actuarial assumption	1.00%
Percentage of reasonably possible decrease in actuarial assumption	1.00%
Post employment plan [member] \| Impact of 100 bps in discount rate [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Percentage of reasonably possible increase in actuarial assumption	1.00%
Percentage of reasonably possible decrease in actuarial assumption	1.00%
Post employment plan [member] \| Impact of 50 bps in rate of increase in future compensation [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Percentage of reasonably possible increase in actuarial assumption	0.50%
Percentage of reasonably possible decrease in actuarial assumption	0.50%
Post employment plan [member] \| Impact of increase in longevity of one additional year [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Period of reasonably possible increase in actuarial assumption	1 year
Post employment plan [member] \| Impact of 100 bps in Healthcare cost trend rate [member]
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Percentage of reasonably possible increase in actuarial assumption	1.00%
Percentage of reasonably possible decrease in actuarial assumption	1.00%

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- Definition

The reasonably possible percentage of the decrease in the actuarial assumption used to determine the present value of defined benefit obligation. [Refer: Actuarial assumptions [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2021-01-01
-Paragraph 145
-Subparagraph a
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-URIDate 2021-03-24

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- Definition

The reasonably possible percentage of the increase in the actuarial assumption used to determine the present value of defined benefit obligation. [Refer: Actuarial assumptions [member]]

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Period of reasonably possible increase in actuarial assumption

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