Stock-based compensation - Summarized Activity Related to Stock Options (Detail) - Stock Options $ / shares in Units, shares in Thousands, $ in Thousands	6 Months Ended
	Apr. 30, 2024 USD ($) $ / shares shares
Number of Options
Beginning balance (in shares) | shares	1,062
Granted (in shares) | shares	55
Exercised (in shares) | shares	(225)
Forfeited or expired (in shares) | shares	(7)
Ending balance (in shares) | shares	885
Expected to vest (in shares) | shares	163
Exercisable (in shares) | shares	721
Weighted- Average Exercise Price  Per Share
Beginning balance (in dollars per share) | $ / shares	$ 152.41
Granted (in dollars per share) | $ / shares	238.80
Exercised (in dollars per share) | $ / shares	124.28
Forfeited or expired (in dollars per share) | $ / shares	229.00
Ending balance (in dollars per share) | $ / shares	164.28
Expected to vest (in dollars per share) | $ / shares	237.97
Exercisable (in dollars per share) | $ / shares	$ 147.42
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Aggregate intrinsic value, outstanding | $	$ 83,848
Aggregate intrinsic value, expected to vest | $	3,631
Aggregate intrinsic value, exercisable | $	$ 80,173
Weighted average remaining term, outstanding	5 years 1 month 6 days
Weighted average remaining term, expected to vest	8 years 1 month 6 days
Weighted average remaining term, exercisable	4 years 4 months 24 days