Employee Benefit Plans - Stock Option Plans and Stock Purchase Rights Granted Under ESPP (Detail) - $ / shares	12 Months Ended
	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2016
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	2.10%	1.73%	1.06%
Risk-free interest rate, maximum	2.95%	2.06%	1.63%
Volatility, minimum	20.22%	18.51%	19.21%
Volatility, maximum	21.04%	19.67%	21.62%
Weighted average estimated fair value (in USD per share)	$ 23.55	$ 13.56	$ 8.97
Employee Stock Purchase Plan
Schedule of Weighted Average Assumptions for Fair Values of Stock Options[Line Items]
Risk-free interest rate, minimum	1.80%	0.82%	0.53%
Risk-free interest rate, maximum	2.73%	1.37%	0.86%
Volatility, minimum	19.99%	17.20%	17.03%
Volatility, maximum	21.54%	19.99%	25.46%
Weighted average estimated fair value (in USD per share)	$ 23.34	$ 18.77	$ 12.75
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