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Segment Disclosure - Schedule of Segment Reporting Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Apr. 30, 2019 | Apr. 30, 2018 | Apr. 30, 2019 | Apr. 30, 2018
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | $ 836,242 | $ 776,836 | $ 1,656,643 | $ 1,546,262
Adjusted operating income | 115,502 | 127,014 | 262,916 | 234,732
Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Adjusted operating income | $ 209,836 | $ 190,116 | $ 410,788 | $ 386,062
Adjusted operating margin | 25.00% | 24.00% | 25.00% | 25.00%
Operating Segments | Semiconductor & System Design: |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | $ 753,055 | $ 709,034 | $ 1,490,961 | $ 1,414,367
Adjusted operating income | $ 201,406 | $ 195,741 | $ 396,724 | $ 394,857
Adjusted operating margin | 27.00% | 28.00% | 27.00% | 28.00%
Operating Segments | Adjusted operating margin |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Total revenue | $ 83,187 | $ 67,802 | $ 165,682 | $ 131,895
Adjusted operating income | $ 8,430 | $ (5,625) | $ 14,064 | $ (8,795)
Adjusted operating margin | 10.00% | (8.00%) | 8.00% | (7.00%)

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