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Derivative financial instruments - Outstanding Currency, Forward Exchange Contracts (Detail) - Foreign Currency Forward Contracts - USD ($) $ in Thousands | Jul. 31, 2022 | Jul. 31, 2021
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Sell |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | $ 168,410 | $ 186,837
Sell | Euro |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 88,275 | 118,988
Sell | British pound |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 36,779 | 27,861
Sell | Japanese yen |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 16,688 | 15,939
Sell | Australian dollar |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 278 | 934
Sell | Hong Kong dollar |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 0 | 283
Sell | Singapore dollar |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 378 | 458
Sell | Others |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 26,012 | 22,374
Buy |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 642,295 | 627,421
Buy | Euro |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 333,285 | 337,817
Buy | British pound |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 78,942 | 86,778
Buy | Japanese yen |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 37,163 | 43,281
Buy | Australian dollar |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 9,426 | 10,462
Buy | Hong Kong dollar |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 67,341 | 37,556
Buy | Singapore dollar |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 18,025 | 18,448
Buy | Others |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | $ 98,113 | $ 93,079

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