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Derivative Financial Instruments - Outstanding Currency, Forward Exchange Contracts (Detail) - Foreign Currency Forward Contracts - USD ($) $ in Thousands | Jul. 31, 2021 | Jul. 31, 2020
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Sell |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | $ 186,837 | $ 205,754
Buy |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 627,421 | 457,903
Euro | Sell |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 118,988 | 108,856
Euro | Buy |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 337,817 | 207,198
British pound | Sell |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 27,861 | 18,861
British pound | Buy |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 86,778 | 60,397
Japanese yen | Sell |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 15,939 | 15,815
Japanese yen | Buy |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 43,281 | 32,009
Australian dollar | Sell |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 934 | 174
Australian dollar | Buy |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 10,462 | 7,682
Hong Kong dollar | Sell |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 283 | 56,279
Hong Kong dollar | Buy |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 37,556 | 74,714
Singapore dollar | Sell |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 458 | 1,357
Singapore dollar | Buy |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 18,448 | 15,982
Others | Sell |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 22,374 | 4,412
Others | Buy |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | $ 93,079 | $ 59,921

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