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Derivative Financial Instruments - Outstanding Currency, Forward Exchange Contracts (Detail) - Foreign Currency Forward Contracts [Member] - USD ($) $ in Thousands | Apr. 30, 2020 | Apr. 30, 2019
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Sell [Member] |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | $ 204,741 | $ 456,372
Buy [Member] |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 417,913 | 582,613
Euro [Member] | Sell [Member] |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 110,114 | 401,545
Euro [Member] | Buy [Member] |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 182,146 | 279,131
British Pound [Member] | Sell [Member] |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 18,987 | 21,012
British Pound [Member] | Buy [Member] |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 58,543 | 44,879
Japanese Yen [Member] | Sell [Member] |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 16,301 | 28,504
Japanese Yen [Member] | Buy [Member] |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 31,934 | 46,226
Australian Dollar [Member] | Sell [Member] |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 327 | 180
Australian Dollar [Member] | Buy [Member] |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 7,647 | 7,771
Hong Kong Dollar [Member] | Sell [Member] |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 53,935 | 1,209
Hong Kong Dollar [Member] | Buy [Member] |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 60,737 | 128,710
Singapore Dollar [Member] | Sell [Member] |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 1,082 | 794
Singapore Dollar [Member] | Buy [Member] |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 15,620 | 15,356
Others [Member] | Sell [Member] |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 3,995 | 3,128
Others [Member] | Buy [Member] |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | $ 61,286 | $ 60,540

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- Definition Nominal or face amount used to calculate payment on derivative. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959 + Details
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