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Income Taxes - Reconciliation of Statutory Federal Income Tax Rate to Effective Consolidated Tax Rate (Detail) | 4 Months Ended | 8 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 30, 2018 | Dec. 31, 2017 | Apr. 30, 2019 | Apr. 30, 2018 | Apr. 30, 2017
Income Tax Disclosure [Abstract] |  |  |  |  |
U.S. federal statutory income tax rate | 21.00% | 35.00% | 21.00% | 30.40% | 35.00%
Foreign tax rates differential |  |  | 5.00% | (2.30%) | (9.10%)
Transition tax |  |  |  | 9.00% |
Deferred tax remeasurement |  |  |  | (2.40%) |
Non-deductible officers compensation |  |  | 1.10% |  |
Excess tax benefit on stock-based compensation |  |  | (3.10%) |  |
Change in valuation allowance |  |  | (2.00%) | (2.30%) | (3.10%)
Other |  |  |  | 1.70% | 2.30%
Effective income tax rate |  |  | 22.00% | 34.10% | 25.10%

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- Definition Percentage of reported income tax expense (benefit) in excess of (less than) expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operations, attributable to increase (decrease) from transition tax on accumulated earnings of controlled foreign corporation deemed repatriated pursuant to Tax Cuts and Jobs Act of 2017. + References No definition available. + Details
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