Stock-based compensation (Tables)

3 Months Ended

Jan. 31, 2023

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, 2023:

	Number of Options	Weighted- Average Exercise Price  Per Share		Aggregate Intrinsic Value		Weighted Average Remaining Term
Outstanding at October 31, 2022	1,187	$	141.82
Granted	78	240.01
Exercised	(73)	122.96
Forfeited or expired	(2)	132.92
Outstanding at January 31, 2023	1,190	$	148.33	$	114,851	5.4 years
Expected to vest	257	$	213.45	$	9,021	7.9 years
Exercisable at January 31, 2023	930	$	130.05	$	105,762	4.7 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, 2023			January 31, 2022
Expected volatility	30.4%	-	31.8%	30.6%	-	30.8%
Expected dividend yield	1.12%	-	1.12%	0.76%	-	0.76%
Risk-free interest rate	3.79%	-	3.82%	1.36%	-	1.47%
Expected life of the option (in years)	5.0	-	6.1	5.3	-	6.2

Summarized Activity Related to Restricted Stock

The following table summarizes activity related to restricted shares during the three months ended January 31, 2023:

	Number of Shares	Weighted-Average Grant Date Fair Value
Restricted shares at October 31, 2022	6	$	167.99
Vested	(3)	165.21
Restricted shares at January 31, 2023	3	$	170.56

Summarized Activity Related to Restricted Stock Units

The following table summarizes activity related to restricted share units during the three months ended January 31, 2023:

	Number of Units	Weighted-Average Grant Date Fair Value
Restricted share units at October 31, 2022	81	$	223.77
Granted	36	237.68
Forfeited	(2)	242.02
Vested	(42)	218.85
Restricted share units at January 31, 2023	73	$	233.00

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, 2023:

	Number of Shares	Weighted-Average Grant Date Fair Value
Outstanding at October 31, 2022	90	$	77.70
Distributions	(4)	50.88
Outstanding at January 31, 2023	86	$	79.73