Stock-Based Compensation - Summarized Activity Related to Stock Options (Detail) - Stock Options $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Oct. 31, 2020 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Options, Outstanding, Beginning balance (in shares) | shares	1,787
Number of Options, Granted (in shares) | shares	391
Number of Options, Exercised (in shares) | shares	(644)
Number of Options, Forfeited or expired (in shares) | shares	(47)
Number of Options, Outstanding, Ending balance (in shares) | shares	1,487
Number of Options, Expected to vest (in shares) | shares	845
Number of Options, Exercisable (in shares) | shares	632
Weighted-Average Exercise Price Per Share, Outstanding, Beginning balance (in dollars per share) | $ / shares	$ 97.74
Weighted-Average Exercise Price Per Share, Granted (in dollars per share) | $ / shares	166.38
Weighted-Average Exercise Price Per Share, Exercised (in dollars per share) | $ / shares	78.91
Weighted-Average Exercise Price Per Share, Forfeited or expired (in dollars per share) | $ / shares	145.52
Weighted-Average Exercise Price Per Share, Outstanding, Ending balance (in dollars per share) | $ / shares	122.45
Weighted-Average Exercise Price Per Share, Expected to vest (in dollars per share) | $ / shares	141.28
Weighted-Average Exercise Price Per Share, Exercisable (in dollars per share) | $ / shares	$ 96.79
Aggregate Intrinsic Value, Outstanding | $	$ 105,536
Aggregate Intrinsic Value, Expected to vest | $	44,065
Aggregate Intrinsic Value, Exercisable | $	$ 61,104
Weighted Average Remaining Term, Outstanding	7 years
Weighted Average Remaining Term, Expected to vest	8 years 1 month 6 days
Weighted Average Remaining Term, Exercisable	5 years 6 months