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Derivative Financial Instruments - Outstanding Currency, Forward Exchange Contracts (Detail) - Foreign Currency Forward Contracts - USD ($) $ in Thousands | Apr. 30, 2021 | Apr. 30, 2020
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Sell |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | $ 174,189 | $ 204,741
Buy |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 581,318 | 417,913
Euro | Sell |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 127,660 | 110,114
Euro | Buy |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 309,020 | 182,146
British pound | Sell |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 21,228 | 18,987
British pound | Buy |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 79,446 | 58,543
Japanese yen | Sell |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 12,228 | 16,301
Japanese yen | Buy |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 38,648 | 31,934
Australian dollar | Sell |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 194 | 327
Australian dollar | Buy |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 10,240 | 7,647
Hong Kong dollar | Sell |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 978 | 53,935
Hong Kong dollar | Buy |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 33,024 | 60,737
Singapore dollar | Sell |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 15 | 1,082
Singapore dollar | Buy |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 18,071 | 15,620
Others | Sell |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 11,886 | 3,995
Others | Buy |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | $ 92,869 | $ 61,286

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