Stock-based compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Jan. 31, 2024	Jan. 31, 2023	Oct. 31, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum number of common shares authorized for grant (in shares)	900,000
Number of common shares available for grant (in shares)	1,885,000
Executive officers and other highly compensated employees salary and annual cash incentive compensation deferrals percentage, maximum	100.00%
Executive officers share-based long-term incentive compensation deferrals percentage, maximum	90.00%
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Option expiring period	10 years
Normal retirement age	65 years
Period for options considered to be forfeited for retirees	12 months
Termination period on death or disability of option holder	12 months
Compensation expense recognized	$ 1,088	$ 1,663
Unrecognized compensation cost related to unvested stock option	$ 8,042
Weighted average period expected to be amortized, non vested shares	2 years 8 months 12 days
Weighted-average expected volatility used	30.70%	30.60%
Weighted average grant date fair value of stock options granted (in dollars per share)	$ 79.81	$ 78.12
Total intrinsic value of options exercised	$ 14,127	$ 8,350
Cash received from the exercise of stock options	$ 14,418	8,807
Stock Options | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum rate of stock option	25.00%
Restricted Shares and Restricted Share Units | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant restricted shares transferred period	3 years
Restricted Shares and Restricted Share Units | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant restricted shares transferred period	1 year
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Normal retirement age	65 years
Period for restricted shares and share units considered to be forfeited for retirees	12 months
Restricted shares termination period for disability or death	12 months
Unrecognized compensation cost related to nonvested restricted stock	$ 0
Expense related to nonvested common shares	0	160
Common share dividends amount included in compensation cost	$ 0	2
Restricted Stock Unit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average period expected to be amortized, non vested shares	2 years 2 months 12 days
Unrecognized compensation cost related to nonvested restricted stock	$ 15,288
Expense related to nonvested common shares	$ 2,226	2,258
Weighted average grant date fair value (in dollars per share)	$ 235.89		$ 236,280
Performance Share Incentive Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award requisite service period	3 years
Compensation expense	$ 1,268	$ 2,062
Unrecognized compensation cost	$ 11,531
Performance Share Incentive Awards | Grant Date One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average grant date fair value (in dollars per share)	$ 229.58	$ 211.25
Performance Share Incentive Awards | Grant Date Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average grant date fair value (in dollars per share)		231.34
Performance Share Incentive Awards | Grant Date Three
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average grant date fair value (in dollars per share)		$ 214.51
Deferred Compensation
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common share dividends amount included in compensation cost	$ 21	$ 18
Executive officers and other highly compensated employees salary and annual cash incentive compensation deferrals percentage, maximum	100.00%
Executive officers share-based long-term incentive compensation deferrals percentage, maximum	90.00%
Deferred Compensation | Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expense related to director deferred compensation	$ 56	$ 80