Stock-based compensation - Summarized Activity Related to Stock Options (Detail) - Stock Options $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Jan. 31, 2025 USD ($) $ / shares shares
Number of Options
Beginning balance (in shares) | shares	855
Granted (in shares) | shares	60
Exercised (in shares) | shares	(10)
Forfeited or expired (in shares) | shares	(1)
Ending balance (in shares) | shares	904
Expected to vest (in shares) | shares	153
Exercisable (in shares) | shares	748
Weighted- Average Exercise Price  Per Share
Beginning balance (in dollars per share) | $ / shares	$ 167.26
Granted (in dollars per share) | $ / shares	209.73
Exercised (in dollars per share) | $ / shares	114.34
Forfeited or expired (in dollars per share) | $ / shares	238.80
Ending balance (in dollars per share) | $ / shares	170.65
Expected to vest (in dollars per share) | $ / shares	230.88
Exercisable (in dollars per share) | $ / shares	$ 158.11
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Aggregate intrinsic value, outstanding | $	$ 50,540
Aggregate intrinsic value, expected to vest | $	631
Aggregate intrinsic value, exercisable | $	$ 49,889
Weighted average remaining term, outstanding	4 years 10 months 24 days
Weighted average remaining term, expected to vest	8 years 9 months 18 days
Weighted average remaining term, exercisable	4 years