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