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Business Combinations - 2020 Acquisitions (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Apr. 30, 2020 | Oct. 31, 2020 | Oct. 31, 2019 | Oct. 31, 2018
Business Acquisition [Line Items] |  |  |  |
Total purchase consideration |  | $ 238,300 |  |
Goodwill |  | 3,365,114 | $ 3,171,179 | $ 3,143,249
Design service arrangement | $ 10,700 |  |  |
Design service arrangement, period | 5 years |  |  |
Series of Individually Immaterial Business Acquisitions |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Total purchase consideration |  | 132,600 |  |
Identifiable intangibles assets acquired |  | 44,700 |  |
Goodwill |  | 92,800 |  |
Semiconductor And System Design |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Total purchase consideration | $ 105,700 |  |  |
Cash paid | 75,700 |  |  |
Consideration transferred, other | 30,000 |  |  |
Identifiable intangibles assets acquired | 20,600 |  |  |
Recognized identifiable assets acquired and liabilities assumed, net | 4,200 |  |  |
Goodwill | $ 80,900 | 2,939,512 | 2,758,926 | 2,730,990
Software Integrity |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Goodwill |  | 425,602 | $ 412,253 | $ 412,259
Software Integrity | Series of Individually Immaterial Business Acquisitions |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Goodwill |  | $ 13,300 |  |

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