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Stock-Based Compensation - Stock Compensation Expense (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Apr. 30, 2020 | Apr. 30, 2019 | Apr. 30, 2020 | Apr. 30, 2019
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Stock-based compensation expense before taxes | $ 56,435 | $ 36,914 | $ 108,318 | $ 75,374
Income tax benefit | (9,808) | (6,214) | (18,826) | (12,688)
Stock-based compensation expense after taxes | 46,627 | 30,700 | 89,492 | 62,686
Cost of products |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Stock-based compensation expense before taxes | 6,116 | 4,065 | 11,696 | 8,191
Cost of maintenance and service |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Stock-based compensation expense before taxes | 2,118 | 1,522 | 4,150 | 2,981
Research and development expense |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Stock-based compensation expense before taxes | 28,893 | 18,115 | 55,102 | 36,419
Sales and marketing expense |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Stock-based compensation expense before taxes | 9,726 | 7,158 | 18,620 | 14,430
General and administrative expense |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Stock-based compensation expense before taxes | $ 9,582 | $ 6,054 | $ 18,750 | $ 13,353

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