Employee Benefit Plans - Stock Option Plans and Stock Purchase Rights Granted Under ESPP (Detail) - $ / shares	12 Months Ended
	Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2017
Stock Option
Schedule of Weighted Average Assumptions for Fair Values of Stock Options[Line Items]
Expected life (in years)	4 years 1 month 6 days	4 years 1 month 6 days	4 years 1 month 6 days
Risk-free interest rate, minimum	1.28%	2.10%	1.73%
Risk-free interest rate, maximum	2.73%	2.95%	2.06%
Volatility, minimum	23.16%	20.22%	18.51%
Volatility, maximum	24.76%	21.04%	19.67%
Weighted average estimated fair value (in USD per share)	$ 22.86	$ 23.55	$ 13.56
Employee Stock Purchase Plan
Schedule of Weighted Average Assumptions for Fair Values of Stock Options[Line Items]
Risk-free interest rate, minimum	1.54%	1.80%	0.82%
Risk-free interest rate, maximum	2.60%	2.73%	1.37%
Volatility, minimum	23.73%	19.99%	17.20%
Volatility, maximum	27.86%	21.54%	19.99%
Weighted average estimated fair value (in USD per share)	$ 35.18	$ 23.34	$ 18.77
Employee Stock Purchase Plan | Minimum
Schedule of Weighted Average Assumptions for Fair Values of Stock Options[Line Items]
Expected life (in years)	6 months	6 months	6 months
Employee Stock Purchase Plan | Maximum
Schedule of Weighted Average Assumptions for Fair Values of Stock Options[Line Items]
Expected life (in years)	2 years	2 years	2 years