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Liabilities and Restructuring Charges - Additional Information (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 30, 2018 | Apr. 30, 2017 | Apr. 30, 2018 | Apr. 30, 2017 | Oct. 31, 2017
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring charges | $ 2,176,000 | $ 12,907,000 | $ 1,894,000 | $ 25,012,000 |
Employee Severance and Benefits |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring charges | 1,800,000 |  |  |  | $ 36,600,000
Cash payments | 9,400,000 |  | 17,300,000 |  |
Employee related restructuring liabilities | 900,000 |  | 900,000 |  | $ 17,500,000.0
Minimum | Employee Severance and Benefits |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and Related Cost, Expected Cost | 8,000,000 |  | 8,000,000 |  |
Maximum | Employee Severance and Benefits |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring and Related Cost, Expected Cost | $ 10,000,000 |  | $ 10,000,000 |  |

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