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Employee Compensation - Share-Based Compensation - Summary of Ranges of Values used for each Option Pricing Assumption (Detail) - yr
12 Months Ended
Oct. 31, 2025
Oct. 31, 2024
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Expected dividend yield 3.60% 4.50%
Expected share price volatility 16.70%  
Risk-free rate of return 2.80%  
Bottom of range [member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Expected share price volatility   17.40%
Risk-free rate of return   3.30%
Expected period until exercise (in years) 6.5 6.5
Top of range [member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Expected share price volatility   17.60%
Risk-free rate of return   3.40%
Expected period until exercise (in years) 7 7