Stock-based compensation (Tables)

3 Months Ended

Jan. 31, 2024

Share-Based Payment Arrangement [Abstract]

Summarized Activity Related to Stock Options

The following table summarizes activity related to stock options for the three months ended January 31, 2024:

	Number of Options	Weighted- Average Exercise Price  Per Share		Aggregate Intrinsic Value		Weighted Average Remaining Term
Outstanding at October 31, 2023	1,062	$	152.41
Granted	55	238.80
Exercised	(116)	128.09
Forfeited or expired	(6)	228.20
Outstanding at January 31, 2024	995	$	159.51	$	92,894	5.1 years
Expected to vest	164	$	237.41	$	2,927	8.4 years
Exercisable at January 31, 2024	828	$	143.80	$	89,927	4.4 years

Fair Value Assumptions of Stock Options

The fair value of each option grant was estimated at the date of grant using the Black-Scholes option-pricing model with the following assumptions:

Three Months Ended	January 31, 2024			January 31, 2023
Expected volatility	30.5%	-	31.7%	30.4%	-	31.8%
Expected dividend yield	1.15%	-	1.15%	1.12%	-	1.12%
Risk-free interest rate	4.22%	-	4.26%	3.79%	-	3.82%
Expected life of the option (in years)	5.0	-	6.2	5.0	-	6.1

Summarized Activity Related to Restricted Stock Units

The following table summarizes activity related to restricted share units during the three months ended January 31, 2024:

	Number of Units	Weighted-Average Grant Date Fair Value
Restricted share units at October 31, 2023	69	$	236.28
Granted	36	233.74
Forfeited	(2)	240.72
Vested	(28)	233.59
Restricted share units at January 31, 2024	75	$	235.89

Summarized Activity Related to Director Deferred Compensation Shares

The following table summarizes activity related to director deferred compensation share equivalent units during the three months ended January 31, 2024:

	Number of Shares	Weighted-Average Grant Date  Fair Value
Outstanding at October 31, 2023	78	$	93.11
Distributions	(5)	53.35
Outstanding at January 31, 2024	73	$	96.11