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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 | Apr. 30, 2018 | Apr. 30, 2017
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Derivative assets: |  |
Fair Value of Derivative Assets | $ 1,778 | $ 129
Derivative liabilities: |  |
Fair Value of Derivative Liabilities | $ 1,025 | $ 846

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- Definition Fair value as of the balance sheet date of all foreign currency derivative assets not designated as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959 + Details
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