Stock-based compensation - Summarized Activity Related to Stock Options (Detail) - Stock Options $ / shares in Units, shares in Thousands, $ in Thousands	9 Months Ended
	Jul. 31, 2023 USD ($) $ / shares shares
Number of Options
Beginning balance (in shares) | shares	1,187
Granted (in shares) | shares	80
Exercised (in shares) | shares	(163)
Forfeited or expired (in shares) | shares	(10)
Ending balance (in shares) | shares	1,094
Expected to vest (in shares) | shares	245
Exercisable (in shares) | shares	846
Weighted- Average Exercise Price  Per Share
Beginning balance (in dollars per share) | $ / shares	$ 141.82
Granted (in dollars per share) | $ / shares	239.44
Exercised (in dollars per share) | $ / shares	115.67
Forfeited or expired (in dollars per share) | $ / shares	206.93
Ending balance (in dollars per share) | $ / shares	151.09
Expected to vest (in dollars per share) | $ / shares	214.42
Exercisable (in dollars per share) | $ / shares	$ 132.58
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Aggregate intrinsic value, outstanding | $	$ 111,165
Aggregate intrinsic value, expected to vest | $	10,006
Aggregate intrinsic value, exercisable | $	$ 101,014
Weighted average remaining term, outstanding	5 years 1 month 6 days
Weighted average remaining term, expected to vest	7 years 6 months
Weighted average remaining term, exercisable	4 years 4 months 24 days