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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, 2022 USD ($) $ / shares shares
Number of Options
Beginning balance (in shares) | shares	1,235
Granted (in shares) | shares	83
Exercised (in shares) | shares	(68)
Forfeited or expired (in shares) | shares	(14)
Ending balance (in shares) | shares	1,236
Expected to vest (in shares) | shares	380
Exercisable (in shares) | shares	854
Weighted- Average Exercise Price  Per Share
Beginning balance (in dollars per share) | $ / shares	$ 130.93
Granted (in dollars per share) | $ / shares	267.51
Exercised (in dollars per share) | $ / shares	115.99
Forfeited or expired (in dollars per share) | $ / shares	204.77
Ending balance (in dollars per share) | $ / shares	140.12
Expected to vest (in dollars per share) | $ / shares	185.05
Exercisable (in dollars per share) | $ / shares	$ 119.99
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Aggregate Intrinsic Value, Outstanding | $	$ 97,385
Aggregate Intrinsic Value, Expected to vest | $	15,565
Aggregate Intrinsic Value, Exercisable | $	$ 81,711
Weighted Average Remaining Term, Outstanding	5 years 9 months 18 days
Weighted Average Remaining Term, Expected to vest	7 years 6 months
Weighted Average Remaining Term, Exercisable	5 years

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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