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Income Taxes - Additional Information (Detail) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 31, 2018 | Oct. 31, 2018 | Oct. 31, 2017 | Oct. 31, 2016
Operating Loss Carryforwards [Line Items] |  |  |  |
Federal statutory rate |  | 23.33% | 35.00% | 35.00%
Tax cuts and jobs act Of 2017 change in tax rate deferred tax asset (liabilities) income tax benefit | $ (69,300,000) |  |  |
Change in tax rate deferred tax asset income tax expense |  | $ 72,000,000 |  |
Change in tax rate, income tax benefit | $ (35,900,000) |  |  |
Provisional income tax expense (benefit) |  | 52,800,000 | $ 0 | $ 0
Income (loss) before income tax expense |  | 299,800,000 | $ 200,300,000 | $ 141,200,000
Increase (decrease) in valuation allowances |  | $ 24,800,000 |  |
Percentage of rate impact in valuation allowance |  | 5.65% | 20.74% | 1.91%
Increase in effective tax rate |  |  |  | 28.00%
Decrease in effective tax rate from foreign tax rates and permanent book-tax differences |  |  |  | 15.90%
Net operating loss and other carryforwards |  | $ 122,800,000 | $ 116,400,000 |
Valuation allowance |  | $ 157,200,000 | 132,400,000 |
Change in deferred tax assets valuation allowance, including tax act impact |  | 11.66% |  |
Unrecognized tax benefits |  | $ 36,200,000 | 26,800,000 | $ 28,500,000
Accrued interest and penalties related to unrecognized tax benefits |  | 4,900,000 | 3,700,000 |
Minimum |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Net decrease in unrecognized tax benefits for the next 12 months |  | 0 |  |
Maximum |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Net decrease in unrecognized tax benefits for the next 12 months |  | 3,000,000 |  |
Intercompany Financing |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Increase (decrease) in valuation allowances |  |  | $ 38,600,000 |
Percentage of rate impact in valuation allowance |  |  | 19.26% |
Non-U.S. |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Income (loss) before income tax expense |  | 102,300,000 | $ 85,200,000 | 49,900,000
Valuation allowance |  | 137,100,000 | 127,300,000 |
Domestic Tax Authority |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Income (loss) before income tax expense |  | 197,500,000 | 115,100,000 | $ 91,300,000
Valuation allowance |  | $ 20,100,000 | $ 5,100,000 |

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