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Derivative financial instruments - Outstanding Currency, Forward Exchange Contracts (Details) - USD ($) $ in Thousands | Jan. 31, 2025 | Jan. 31, 2024
--- | --- | ---
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | $ 811,531 |
Foreign Currency Forward Contracts | Notional Sell Amounts |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 206,711 | $ 149,312
Foreign Currency Forward Contracts | Notional Sell Amounts | Euro |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 138,952 | 111,826
Foreign Currency Forward Contracts | Notional Sell Amounts | British pound |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 24,087 | 19,136
Foreign Currency Forward Contracts | Notional Sell Amounts | Mexican Peso |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 37 | 925
Foreign Currency Forward Contracts | Notional Sell Amounts | Japanese yen |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 22,217 | 12,024
Foreign Currency Forward Contracts | Notional Sell Amounts | Hong Kong dollar |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 1,844 | 0
Foreign Currency Forward Contracts | Notional Sell Amounts | Australian dollar |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 284 | 0
Foreign Currency Forward Contracts | Notional Sell Amounts | Singapore dollar |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 8,313 | 72
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 | 10,977 | 5,329
Foreign Currency Forward Contracts | Notional Sell Amounts |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 511,036 | 464,886
Foreign Currency Forward Contracts | Notional Sell Amounts | Euro |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 170,725 | 96,737
Foreign Currency Forward Contracts | Notional Sell Amounts | British pound |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 172,779 | 180,224
Foreign Currency Forward Contracts | Notional Sell Amounts | Mexican Peso |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 25,260 | 33,885
Foreign Currency Forward Contracts | Notional Sell Amounts | Japanese yen |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 24,307 | 23,985
Foreign Currency Forward Contracts | Notional Sell Amounts | Hong Kong dollar |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 2,528 | 7,453
Foreign Currency Forward Contracts | Notional Sell Amounts | Australian dollar |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 10,421 | 9,334
Foreign Currency Forward Contracts | Notional Sell Amounts | Singapore dollar |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 21,376 | 20,062
Foreign Currency Forward Contracts | Notional Sell Amounts | Taiwan Dollar |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | 8,002 | 8,000
Foreign Currency Forward Contracts | Notional Sell Amounts | Others |  |
Derivative [Line Items] |  |
Notional Amounts of foreign currency derivative contracts | $ 75,638 | $ 85,206

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