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Derivative financial instruments - Outstanding Currency, Forward Exchange Contracts (Detail) - USD ($) $ in Thousands | Jan. 31, 2024 | Jan. 31, 2023
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Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | $ 815,256 |
Foreign Currency Forward Contracts | Notional Sell Amounts |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 149,312 | $ 152,604
Foreign Currency Forward Contracts | Notional Sell Amounts | Euro |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 111,826 | 93,142
Foreign Currency Forward Contracts | Notional Sell Amounts | British pound |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 19,136 | 27,965
Foreign Currency Forward Contracts | Notional Sell Amounts | Mexican Peso |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 925 | 11,658
Foreign Currency Forward Contracts | Notional Sell Amounts | Japanese yen |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 12,024 | 11,644
Foreign Currency Forward Contracts | Notional Sell Amounts | Hong Kong dollar |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 0 | 4,180
Foreign Currency Forward Contracts | Notional Sell Amounts | Australian dollar |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 0 | 375
Foreign Currency Forward Contracts | Notional Sell Amounts | Singapore dollar |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 72 | 245
Foreign Currency Forward Contracts | Notional Sell Amounts | Taiwan Dollar |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 0 | 0
Foreign Currency Forward Contracts | Notional Sell Amounts | Others |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 5,329 | 3,395
Foreign Currency Forward Contracts | Notional Sell Amounts |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 464,886 | 855,150
Foreign Currency Forward Contracts | Notional Sell Amounts | Euro |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 96,737 | 398,560
Foreign Currency Forward Contracts | Notional Sell Amounts | British pound |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 180,224 | 112,945
Foreign Currency Forward Contracts | Notional Sell Amounts | Mexican Peso |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 33,885 | 31,315
Foreign Currency Forward Contracts | Notional Sell Amounts | Japanese yen |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 23,985 | 35,772
Foreign Currency Forward Contracts | Notional Sell Amounts | Hong Kong dollar |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 7,453 | 148,653
Foreign Currency Forward Contracts | Notional Sell Amounts | Australian dollar |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 9,334 | 8,821
Foreign Currency Forward Contracts | Notional Sell Amounts | Singapore dollar |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 20,062 | 18,862
Foreign Currency Forward Contracts | Notional Sell Amounts | Taiwan Dollar |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 8,000 | 35,047
Foreign Currency Forward Contracts | Notional Sell Amounts | Others |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | $ 85,206 | $ 65,175

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