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Contingencies (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2019 | Oct. 31, 2018
Loss Contingencies [Line Items] |  |
Patent cross-license | 7 years |
Mentor Patent Litigation |  |
Loss Contingencies [Line Items] |  |
Payments for legal settlements |  | $ 65,000,000
Minimum | Mentor Patent Litigation |  |
Loss Contingencies [Line Items] |  |
Potential one-time termination charge | $ 0.0 |
Maximum | Mentor Patent Litigation |  |
Loss Contingencies [Line Items] |  |
Potential one-time termination charge | $ 25,000,000 |

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