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Financial Instruments - Fair Value of Derivatives Not Designated as Hedge Instruments (Detail) - Not Designated as Hedge Instrument - Foreign Exchange Forward Contracts - USD ($) $ in Thousands | Jul. 31, 2018 | Apr. 30, 2018
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Derivative assets: |  |
Fair Value of Derivative Assets | $ 603 | $ 1,778
Derivative liabilities: |  |
Fair Value of Derivative Liabilities | $ 621 | $ 1,025

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