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Income Taxes - Income Tax Expense (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Apr. 30, 2019 | Apr. 30, 2018
Current tax expense (benefit): |  |
Federal | $ (571) | $ 1,719
State and local | (75) | 311
Foreign | 1,065 | 1,414
Total current tax expense | 419 | 3,444
Deferred tax expense (benefit): |  |
Federal | 30 | 442
State and local | 59 | 33
Foreign | (62) | 242
Total deferred tax expense (benefit) | 27 | 717
Net income tax expense | $ 446 | $ 4,161

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