Stock-Based Compensation - Stock Compensation Expense (Detail) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		6 Months Ended
		Apr. 30, 2022	Apr. 30, 2021	Apr. 30, 2022	Apr. 30, 2021
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense before taxes	[1]	$ 110,061	$ 79,586	$ 205,832	$ 163,368
Income tax benefit		(17,852)	(12,407)	(33,386)	(25,469)
Stock-based compensation expense after taxes		$ 92,209	67,179	$ 172,446	137,899
Restricted Stock Units (RSUs), Market-based
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Grant date fair value (in USD per share)				$ 280.82
Expected volatility				33.01%
Risk-free interest rate				1.33%
Expected term				1 year 8 months 8 days
Restricted Stock Units (RSUs), Market-based | Maximum
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Target number of initial award earned, percentage		187.50%		187.50%
Cost of products
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense before taxes		$ 13,078	9,304	$ 24,285	18,656
Cost of maintenance and service
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense before taxes		5,893	3,411	10,476	6,746
Research and development expense
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense before taxes		58,109	40,507	107,649	81,801
Sales and marketing expense
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense before taxes		19,291	14,551	37,092	29,710
General and administrative expense
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense before taxes		$ 13,690	$ 11,813	$ 26,330	$ 26,455

[1] (1) During the three and six months ended April 30, 2022, we recognized stock-based compensation expense relating to restricted stock units (RSUs), granted to senior executives in February 2022 with certain market, performance and service conditions (market-based RSUs). Under the award agreements, the vesting of the market-based RSUs is contingent on achieving total stockholder return (TSR) relative to a peer index as well as revenue growth metrics. The performance period during which the achievement goals will be measured is fiscal 2022 and fiscal 2023. The maximum potential awards that may be earned are 187.5% of the target number of the initial awards. The awards will vest in equal increments in December 2023 and December 2024 if the TSR target, revenue growth metrics, and service conditions are achieved. The grant date fair value for the market-based RSUs of $280.82 was determined using a Monte Carlo simulation model with the following assumptions: expected volatility of 33.01%, risk-free interest rate of 1.33% and an expected term of 1.69 years.