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Fair Value of Derivatives Not Designated as Hedge Instruments (Detail) - Not Designated as Hedge Instrument - Foreign Exchange Forward Contracts - USD ($) $ in Thousands | Jan. 31, 2017 | Apr. 30, 2016
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Derivative assets: |  |
Fair Value of Derivative Assets | $ 338 | $ 324
Derivative liabilities: |  |
Fair Value of Derivative Liabilities | $ 902 | $ 1,041

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