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Income Taxes - Income Tax Expense (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Apr. 30, 2017 | Apr. 30, 2016 | Apr. 30, 2015
Current tax expense: |  |  |
Federal | $ 891 | $ 974 | $ 759
State and local | 120 | 117 | 151
Foreign | 1,467 | 1,122 | 1,348
Total current tax expense | 2,478 | 2,213 | 2,258
Deferred tax expense (benefit): |  |  |
Federal | (108) | (431) | (187)
State and local | 24 | 98 | (70)
Foreign | (268) | (18) | (256)
Total deferred tax benefit | (352) | (351) | (513)
Net income tax expense | $ 2,126 | $ 1,862 | $ 1,745

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