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Segment Disclosure - Reportable Segment Information (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Oct. 31, 2020 | Oct. 31, 2019 | Oct. 31, 2018
Segment Reporting Information [Line Items] |  |  |
Revenues | $ 3,685,281 | $ 3,360,694 | $ 3,121,058
Adjusted operating income | 620,141 | 520,231 | 360,225
Operating Segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Adjusted operating income | $ 1,031,630 | $ 838,821 | $ 690,681
Adjusted operating margin | 28.00% | 25.00% | 22.00%
Operating Segments | Semiconductor And System Design |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | $ 3,327,211 | $ 3,026,097 | $ 2,840,589
Adjusted operating income | $ 990,837 | $ 806,618 | $ 701,283
Adjusted operating margin | 30.00% | 27.00% | 25.00%
Operating Segments | Software Integrity |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | $ 358,070 | $ 334,597 | $ 280,469
Adjusted operating income | $ 40,793 | $ 32,203 | $ (10,602)
Adjusted operating margin | 11.00% | 10.00% | (4.00%)

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