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Liabilities and Restructuring Charges - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 30, 2017 | Apr. 30, 2016 | Apr. 30, 2017 | Apr. 30, 2016 | Oct. 31, 2016
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring charges | $ 12,907 | $ 894 | $ 25,012 | $ 2,987 |
Employee Severance and Benefits |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring charges | 12,900 |  | 25,012 |  |
Cash payments |  |  | 18,819 |  |
Employee related restructuring liabilities | 11,872 |  | 11,872 |  | $ 5,679
2016 Restructuring Plans | Employee Severance and Benefits |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring charges |  |  |  |  | $ 9,600
Minimum | Employee Severance and Benefits |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Expected restructuring costs | 32,000 |  | 32,000 |  |
Maximum | Employee Severance and Benefits |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Expected restructuring costs | $ 34,000 |  | $ 34,000 |  |

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