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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
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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+ References

No definition available.

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- Definition

Nominal or face amount used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5579245-113959

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