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, 2023 USD ($) $ / shares shares
Number of Options
Beginning balance (in shares) | shares	1,187
Granted (in shares) | shares	80
Exercised (in shares) | shares	(101)
Forfeited or expired (in shares) | shares	(9)
Ending balance (in shares) | shares	1,157
Expected to vest (in shares) | shares	251
Exercisable (in shares) | shares	902
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	118.73
Forfeited or expired (in dollars per share) | $ / shares	209.26
Ending balance (in dollars per share) | $ / shares	148.97
Expected to vest (in dollars per share) | $ / shares	213.72
Exercisable (in dollars per share) | $ / shares	$ 130.77
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Aggregate intrinsic value, outstanding | $	$ 83,261
Aggregate intrinsic value, expected to vest | $	4,992
Aggregate intrinsic value, exercisable | $	$ 78,167
Weighted average remaining term, outstanding	5 years 2 months 12 days
Weighted average remaining term, expected to vest	7 years 8 months 12 days
Weighted average remaining term, exercisable	4 years 6 months