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Derivative financial instruments - Outstanding Currency, Forward Exchange Contracts (Detail) - USD ($) $ in Thousands | Apr. 30, 2024 | Apr. 30, 2023
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Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | $ 730,716 |
Foreign Currency Forward Contracts | Notional Sell Amounts |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 184,014 | $ 162,822
Foreign Currency Forward Contracts | Notional Sell Amounts | Euro |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 137,867 | 109,595
Foreign Currency Forward Contracts | Notional Sell Amounts | British pound |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 17,490 | 28,614
Foreign Currency Forward Contracts | Notional Sell Amounts | Mexican Peso |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 927 | 871
Foreign Currency Forward Contracts | Notional Sell Amounts | Japanese yen |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 18,665 | 21,619
Foreign Currency Forward Contracts | Notional Sell Amounts | Hong Kong dollar |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 3,739 | 0
Foreign Currency Forward Contracts | Notional Sell Amounts | Australian dollar |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 331 | 0
Foreign Currency Forward Contracts | Notional Sell Amounts | Singapore dollar |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 109 | 60
Foreign Currency Forward Contracts | Notional Sell Amounts | Taiwan Dollar |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 0 | 0
Foreign Currency Forward Contracts | Notional Sell Amounts | Others |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 4,886 | 2,063
Foreign Currency Forward Contracts | Notional Sell Amounts |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 517,911 | 584,675
Foreign Currency Forward Contracts | Notional Sell Amounts | Euro |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 145,019 | 155,683
Foreign Currency Forward Contracts | Notional Sell Amounts | British pound |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 181,427 | 123,134
Foreign Currency Forward Contracts | Notional Sell Amounts | Mexican Peso |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 32,979 | 27,577
Foreign Currency Forward Contracts | Notional Sell Amounts | Japanese yen |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 27,588 | 26,700
Foreign Currency Forward Contracts | Notional Sell Amounts | Hong Kong dollar |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 7,438 | 148,303
Foreign Currency Forward Contracts | Notional Sell Amounts | Australian dollar |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 9,441 | 8,892
Foreign Currency Forward Contracts | Notional Sell Amounts | Singapore dollar |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 19,867 | 19,759
Foreign Currency Forward Contracts | Notional Sell Amounts | Taiwan Dollar |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 8,000 | 8,000
Foreign Currency Forward Contracts | Notional Sell Amounts | Others |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | $ 86,152 | $ 66,627

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