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Derivative financial instruments - Outstanding Currency, Forward Exchange Contracts (Detail) - Foreign Currency Forward Contracts - USD ($) $ in Thousands | Apr. 30, 2022 | Apr. 30, 2021
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Sell |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | $ 169,360 | $ 174,189
Buy |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 631,871 | 581,318
Euro | Sell |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 96,436 | 127,660
Euro | Buy |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 337,291 | 309,020
British pound | Sell |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 38,478 | 21,228
British pound | Buy |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 80,853 | 79,446
Japanese yen | Sell |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 10,848 | 12,228
Japanese yen | Buy |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 39,294 | 38,648
Australian dollar | Sell |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 295 | 194
Australian dollar | Buy |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 9,269 | 10,240
Hong Kong dollar | Sell |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 7,727 | 978
Hong Kong dollar | Buy |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 55,666 | 33,024
Singapore dollar | Sell |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 198 | 15
Singapore dollar | Buy |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 17,899 | 18,071
Others | Sell |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 15,378 | 11,886
Others | Buy |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | $ 91,599 | $ 92,869

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