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Derivative financial instruments - Outstanding Currency, Forward Exchange Contracts (Details) - USD ($) $ in Thousands | Apr. 30, 2025 | Apr. 30, 2024
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Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | $ 852,403 |
Foreign Currency Forward Contracts | Notional Sell Amounts |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 219,389 | $ 184,014
Foreign Currency Forward Contracts | Notional Sell Amounts | Euro |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 152,965 | 137,867
Foreign Currency Forward Contracts | Notional Sell Amounts | British pound |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 20,659 | 17,490
Foreign Currency Forward Contracts | Notional Sell Amounts | Mexican Peso |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 3,413 | 927
Foreign Currency Forward Contracts | Notional Sell Amounts | Japanese yen |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 27,285 | 18,665
Foreign Currency Forward Contracts | Notional Sell Amounts | Hong Kong dollar |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 1,296 | 3,739
Foreign Currency Forward Contracts | Notional Sell Amounts | Australian dollar |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 1,085 | 331
Foreign Currency Forward Contracts | Notional Sell Amounts | Singapore dollar |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 1,667 | 109
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 | 11,019 | 4,886
Foreign Currency Forward Contracts | Notional Sell Amounts |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 567,038 | 517,911
Foreign Currency Forward Contracts | Notional Sell Amounts | Euro |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 216,275 | 145,019
Foreign Currency Forward Contracts | Notional Sell Amounts | British pound |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 171,023 | 181,427
Foreign Currency Forward Contracts | Notional Sell Amounts | Mexican Peso |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 25,522 | 32,979
Foreign Currency Forward Contracts | Notional Sell Amounts | Japanese yen |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 33,238 | 27,588
Foreign Currency Forward Contracts | Notional Sell Amounts | Hong Kong dollar |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 5,691 | 7,438
Foreign Currency Forward Contracts | Notional Sell Amounts | Australian dollar |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 9,568 | 9,441
Foreign Currency Forward Contracts | Notional Sell Amounts | Singapore dollar |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 26,579 | 19,867
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 | $ 71,142 | $ 86,152

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