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Income Taxes - Income Tax Expense (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Apr. 30, 2015 | Apr. 30, 2014 | Apr. 30, 2013
Current tax expense: |  |  |
Federal | $ 759 | $ 907 | $ 941
State and local | 151 | 168 | 184
Foreign | 1,348 | 917 | 791
Total current tax expense | 2,258 | 1,992 | 1,916
Deferred tax expense (benefit): |  |  |
Federal | (187) | 27 | (346)
State and local | (70) | 26 | (24)
Foreign | (256) | (62) | (6)
Total deferred tax benefit | (513) | (9) | (376)
Net income tax expense | $ 1,745 | $ 1,983 | $ 1,540

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