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Income Taxes - Additional Information (Detail) - USD ($) | 4 Months Ended | 8 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Apr. 30, 2018 | Dec. 31, 2017 | Apr. 30, 2019 | Apr. 30, 2018 | Apr. 30, 2017 | Apr. 30, 2016
Schedule Of Income Taxes [Line Items] |  |  |  |  |  |
U.S. corporate federal statutory income tax rate | 21.00% | 35.00% | 21.00% | 30.40% | 35.00% |
Provisional tax charge for one-time tax on accumulated foreign earnings |  |  |  | $ 18,400,000 |  |
Provisional tax (benefit) from remeasurement of U.S. federal |  |  |  | (5,900,000) |  |
Undistributed earnings of foreign subsidiaries |  |  | $ 555,400,000 |  |  |
Unrecognized tax benefits liability | $ 3,674,000 |  | 7,794,000 | 3,674,000 | $ 2,478,000 | $ 2,095,000
Unrecognized tax benefits, reductions resulting from resolution |  |  | (3,700,000) |  |  |
Unrecognized tax benefits, interest on income taxes accrued | 300,000 |  | 400,000 | 300,000 |  |
Unrecognized tax benefits, income tax penalties accrued | $ 0 |  | 0 | 0 |  |
Recognized interest expense |  |  | 100,000 | $ 300,000 | $ 100,000 |
Internal Revenue Service (IRS) |  |  |  |  |  |
Schedule Of Income Taxes [Line Items] |  |  |  |  |  |
Net operating loss carryforward |  |  | $ 2,900,000 |  |  |
Net operating loss carryforward, beginning expiration |  |  | 2028 |  |  |
State and Local Jurisdiction |  |  |  |  |  |
Schedule Of Income Taxes [Line Items] |  |  |  |  |  |
Net operating loss carryforward |  |  | $ 39,800,000 |  |  |
Net operating loss carryforward, beginning expiration |  |  | 2020 |  |  |
Foreign Tax Authority |  |  |  |  |  |
Schedule Of Income Taxes [Line Items] |  |  |  |  |  |
Net operating loss carryforward |  |  | $ 79,900,000 |  |  |
Net operating loss carryforward, beginning expiration |  |  | 2020 |  |  |

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