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Liabilities and Restructuring Charges - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jul. 31, 2019 | Jul. 31, 2018 | Jul. 31, 2019 | Jul. 31, 2018 | Oct. 31, 2018
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring | $ 19,338 | $ 23 | $ 33,746 | $ 1,917 |
Employee Severance and Benefits |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring | 19,300 |  | 33,700 | 1,900 |
Employee related restructuring liabilities | 20,800 |  | 20,800 |  | $ 8,100
Minimum | Employee Severance and Benefits |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and Related Cost, Expected Cost | 43,000 | 8,000 | 43,000 | 8,000 |
Maximum | Employee Severance and Benefits |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and Related Cost, Expected Cost | $ 65,000 | $ 10,000 | $ 65,000 | $ 10,000 |

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