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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands | 2 Months Ended | 3 Months Ended | 4 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Dec. 31, 2017 | Apr. 30, 2018 | Apr. 30, 2017 | Apr. 30, 2018 | Apr. 30, 2018 | Apr. 30, 2017 | Oct. 31, 2018
Income Tax [Line Items] |  |  |  |  |  |  |
Effective tax rates |  | 22.80% | 31.80% |  | 11.70% | 30.60% |
U.S. federal corporate income tax rate | 35.00% |  |  | 21.00% |  |  |
Provisional tax benefit due to revaluation of tax assets and liabilities at reduced corporate tax rate |  | $ 45,213 |  |  |  |  |
Provisional tax expense to reflect the transition tax on previously deferred foreign earnings |  |  |  |  | $ 23,124 |  |
Decrease in income tax expense |  |  |  |  | $ 22,089 |  |
Payment of transition tax in installments, period |  |  |  |  | 8 years |  |
Discrete tax benefit |  | $ 2,202 |  |  | $ 6,950 |  |
Discrete tax expense related to nondeductible acquisition costs |  |  | $ 2,600 |  |  |  |
Scenario Plan |  |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |  |
U.S. federal corporate income tax rate |  |  |  |  |  |  | 23.30%

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