Stock-Based Compensation - Fair Value Assumptions of Stock Options (Detail) - Stock Options	6 Months Ended
	Apr. 30, 2021	Apr. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility, Minimum	30.80%	24.50%
Expected volatility, Maximum	32.60%	29.20%
Risk-free interest rate, Minimum	0.43%	0.50%
Risk-free interest rate, Maximum	0.77%	1.69%
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected dividend yield	0.83%	0.92%
Expected life of the option (in years)	5 years 3 months 18 days	5 years 3 months 18 days
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected dividend yield	0.85%	1.16%
Expected life of the option (in years)	6 years 2 months 12 days	6 years 2 months 12 days