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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions | 4 Months Ended | 8 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Apr. 30, 2018 | Dec. 31, 2018 | Jan. 31, 2018 | Apr. 30, 2018
Schedule Of Income Tax [Line Items] |  |  |  |
U.S. corporate federal statutory income tax rate |  | 35.00% |  |
Provisional tax charge for the Transition Tax |  |  | $ 16.3 |
Provisional tax benefit from remeasurement of U.S. federal deferred tax assets and liabilities |  |  | $ 5.8 |
Scenario, Forecast |  |  |  |
Schedule Of Income Tax [Line Items] |  |  |  |
U.S. corporate federal statutory income tax rate | 21.00% |  |  | 30.40%
One-time tax on accumulated foreign earnings (Transition Tax), applicable rate on cash and other specified assets | 15.50% |  |  |
One-time tax on accumulated foreign earnings (Transition Tax), applicable rate on other residual earnings | 8.00% |  |  |

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