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Restructuring Charges - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Apr. 30, 2017 | Apr. 30, 2016 | Apr. 30, 2017 | Apr. 30, 2016 | Oct. 31, 2016
Restructuring and Related Costs [Line Items] |  |  |  |  |
Restructuring charges | $ 5.1 | $ 5.4 | $ 4.8 | $ 7.7 |
Amounts Remaining to be Incurred | 19.8 |  | 19.8 |  | $ 16.1
Employee Separation Costs |  |  |  |  |
Restructuring and Related Costs [Line Items] |  |  |  |  |
Restructuring charges | 4.7 |  | 3.9 |  |
Other Costs |  |  |  |  |
Restructuring and Related Costs [Line Items] |  |  |  |  |
Restructuring charges | $ 0.4 |  | $ 0.9 |  |

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