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Financial Instruments - Additional Information (Detail) - USD ($) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 | Apr. 30, 2018 | Apr. 30, 2017 | Apr. 30, 2016
Financial Instrument [Line Items] |  |  |  |
Proceeds from maturities of available-for-sale marketable securities |  |  |  | $ 13,100,000
Maximum |  |  |  |
Financial Instrument [Line Items] |  |  |  |
Derivative gains included in AOCI |  | $ 400,000 |  |
Not Designated as Hedge Instrument | Foreign Exchange Forward Contracts |  |  |  |
Financial Instrument [Line Items] |  |  |  |
Foreign currency gains (losses) |  | (3,700,000) | $ 600,000 | $ (1,800,000)
Not Designated as Hedge Instrument | Foreign Exchange Forward Contracts | Other Accrued Liabilities | Derivatives Purchased |  |  |  |
Financial Instrument [Line Items] |  |  |  |
Derivative notional amount |  | 80,800,000 | 19,400,000 |
Not Designated as Hedge Instrument | Foreign Exchange Forward Contracts | Other Accrued Liabilities | Derivatives Sold |  |  |  |
Financial Instrument [Line Items] |  |  |  |
Derivative notional amount |  | 78,500,000 | $ 70,000,000 |
Designated as Hedge Instrument | Interest Rate Swap | Cash Flow Hedge |  |  |  |
Financial Instrument [Line Items] |  |  |  |
Derivative notional amount | $ 129,800,000 | $ 119,500,000 |  |
Derivative, Maturity Date | Jun. 15, 2021 |  |  |
Interest rate |  | 1.919% |  |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Financial Instrument [Line Items] + References No definition available. + Details
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- Definition The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994 + Details
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- Definition Fixed interest rate related to the interest rate derivative. + References No definition available. + Details
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- Definition Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying 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 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 + Details
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- Definition Date the derivative contract matures, in CCYY-MM-DD format. + References No definition available. + Details
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- Definition The cash inflow associated with the sale or maturity (principal being due) of securities not classified as either held-to-maturity securities or trading securities which are classified as available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26853-111562 + Details
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