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, 2024 USD ($) $ / shares shares
Number of Options
Beginning balance (in shares) | shares	1,062
Granted (in shares) | shares	61
Exercised (in shares) | shares	(243)
Forfeited or expired (in shares) | shares	(7)
Ending balance (in shares) | shares	873
Expected to vest (in shares) | shares	164
Exercisable (in shares) | shares	707
Weighted- Average Exercise Price  Per Share
Beginning balance (in dollars per share) | $ / shares	$ 152.41
Granted (in dollars per share) | $ / shares	238.35
Exercised (in dollars per share) | $ / shares	122.43
Forfeited or expired (in dollars per share) | $ / shares	229.00
Ending balance (in dollars per share) | $ / shares	166.21
Expected to vest (in dollars per share) | $ / shares	239.41
Exercisable (in dollars per share) | $ / shares	$ 149.00
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Aggregate intrinsic value, outstanding | $	$ 74,716
Aggregate intrinsic value, expected to vest | $	2,428
Aggregate intrinsic value, exercisable | $	$ 72,263
Weighted average remaining term, outstanding	4 years 10 months 24 days
Weighted average remaining term, expected to vest	8 years
Weighted average remaining term, exercisable	4 years 2 months 12 days