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Derivative financial instruments - Outstanding Currency, Forward Exchange Contracts (Detail) - Foreign Currency Forward Contracts - Notional Sell Amounts - USD ($) $ in Thousands | Apr. 30, 2023 | Apr. 30, 2022
--- | --- | ---
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | $ 162,822 | $ 169,360
Euro |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 109,595 | 96,436
British pound |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 28,614 | 38,478
Mexican Peso |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 871 |
Japanese yen |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 21,619 | 10,848
Hong Kong dollar |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 0 | 7,727
Australian dollar |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 0 | 295
Singapore dollar |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 60 | 198
Taiwan Dollar |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 0 |
Others |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 2,063 | 15,378
Notional Amounts of foreign currency derivative contracts | 584,675 | 631,871
Euro |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 155,683 | 337,291
British pound |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 123,134 | 80,853
Mexican Peso |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 27,577 |
Japanese yen |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 26,700 | 39,294
Hong Kong dollar |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 148,303 | 55,666
Australian dollar |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 8,892 | 9,269
Singapore dollar |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 19,759 | 17,899
Taiwan Dollar |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 8,000 |
Others |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | $ 66,627 | $ 91,599

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