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v3.25.3

Employee Benefits - Summary of weighted-average actual and target asset allocations (Detail) | 12 Months Ended
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Oct. 31, 2025 | Oct. 31, 2024
Pension plans [member] |  |
Disclosure of defined benefit plans [line items] |  |
Defined benefit plan weighted average asset allocation | 100.00% | 100.00%
Defined benefit plan target asset allocation | 100.00% |
Pension plans [member] | Cash and cash equivalents [member] |  |
Disclosure of defined benefit plans [line items] |  |
Defined benefit plan weighted average asset allocation | 1.00% | 2.00%
Pension plans [member] | Equity securities [member] |  |
Disclosure of defined benefit plans [line items] |  |
Defined benefit plan weighted average asset allocation | 49.00% | 48.00%
Defined benefit plan target asset allocation | 41.00% |
Pension plans [member] | Equity securities [member] | Quote in an active market [member] |  |
Disclosure of defined benefit plans [line items] |  |
Defined benefit plan weighted average asset allocation | 44.00% | 43.00%
Pension plans [member] | Equity securities [member] | Non quoted [member] |  |
Disclosure of defined benefit plans [line items] |  |
Defined benefit plan weighted average asset allocation | 5.00% | 5.00%
Pension plans [member] | Fixed Income Investments 1 [Member] |  |
Disclosure of defined benefit plans [line items] |  |
Defined benefit plan weighted average asset allocation | 39.00% | 39.00%
Defined benefit plan target asset allocation | 44.00% |
Pension plans [member] | Fixed Income Investments 1 [Member] | Quote in an active market [member] |  |
Disclosure of defined benefit plans [line items] |  |
Defined benefit plan weighted average asset allocation | 6.00% | 10.00%
Pension plans [member] | Fixed Income Investments 1 [Member] | Non quoted [member] |  |
Disclosure of defined benefit plans [line items] |  |
Defined benefit plan weighted average asset allocation | 33.00% | 29.00%
Pension plans [member] | Investment property [member] |  |
Disclosure of defined benefit plans [line items] |  |
Defined benefit plan weighted average asset allocation | 1.00% | 1.00%
Defined benefit plan target asset allocation | 1.00% |
Pension plans [member] | Investment property [member] | Non quoted [member] |  |
Disclosure of defined benefit plans [line items] |  |
Defined benefit plan weighted average asset allocation | 1.00% | 1.00%
Pension plans [member] | Other securities [member] |  |
Disclosure of defined benefit plans [line items] |  |
Defined benefit plan weighted average asset allocation | 10.00% | 10.00%
Defined benefit plan target asset allocation | 14.00% |
Pension plans [member] | Other securities [member] | Non quoted [member] |  |
Disclosure of defined benefit plans [line items] |  |
Defined benefit plan weighted average asset allocation | 10.00% | 10.00%
Other benefit plans [member] |  |
Disclosure of defined benefit plans [line items] |  |
Defined benefit plan weighted average asset allocation | 100.00% | 100.00%
Defined benefit plan target asset allocation | 100.00% |
Other benefit plans [member] | Equity securities [member] |  |
Disclosure of defined benefit plans [line items] |  |
Defined benefit plan weighted average asset allocation | 15.00% | 12.00%
Defined benefit plan target asset allocation | 15.00% |
Other benefit plans [member] | Equity securities [member] | Quote in an active market [member] |  |
Disclosure of defined benefit plans [line items] |  |
Defined benefit plan weighted average asset allocation | 15.00% | 12.00%
Other benefit plans [member] | Equity securities [member] | Non quoted [member] |  |
Disclosure of defined benefit plans [line items] |  |
Defined benefit plan weighted average asset allocation | 0.00% |
Other benefit plans [member] | Fixed Income Investments 1 [Member] |  |
Disclosure of defined benefit plans [line items] |  |
Defined benefit plan weighted average asset allocation | 83.00% | 87.00%
Defined benefit plan target asset allocation | 83.00% |
Other benefit plans [member] | Fixed Income Investments 1 [Member] | Quote in an active market [member] |  |
Disclosure of defined benefit plans [line items] |  |
Defined benefit plan weighted average asset allocation | 83.00% | 87.00%
Other benefit plans [member] | Investment property [member] |  |
Disclosure of defined benefit plans [line items] |  |
Defined benefit plan weighted average asset allocation | 2.00% | 1.00%
Defined benefit plan target asset allocation | 2.00% |
Other benefit plans [member] | Investment property [member] | Quote in an active market [member] |  |
Disclosure of defined benefit plans [line items] |  |
Defined benefit plan weighted average asset allocation | 2.00% | 1.00%

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