Stock-based compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Apr. 30, 2024	Apr. 30, 2023	Apr. 30, 2024	Apr. 30, 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		900,000
Number of common shares available for grant (in shares)	1,888,000		1,888,000
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	$ 1,446	$ 1,622	$ 2,534	$ 3,285
Unrecognized compensation cost related to unvested stock option	6,558		$ 6,558
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	$ 77.99
Total intrinsic value of options exercised	16,044	3,783	$ 30,171	$ 12,133
Cash received from the exercise of stock options			$ 27,219	11,808
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		$ 0
Expense related to nonvested common shares	0	103	0	263
Common share dividends amount included in compensation cost	0	1	$ 0	3
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
Unrecognized compensation cost related to nonvested restricted stock	12,452		$ 12,452
Expense related to nonvested common shares	$ 2,234	2,248
Weighted average grant date fair value (in dollars per share)	$ 236.48		$ 236.48		$ 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	$ 1,598	$ 892	$ 2,866	$ 2,954
Unrecognized compensation cost	$ 9,799		$ 9,799
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	$ 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		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		$ 214.51
Deferred Compensation
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common share dividends amount included in compensation cost	$ 27	$ 29	$ 48	$ 47
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	$ 79	$ 78	$ 135	$ 158