Derivative financial instruments - Outstanding Currency, Forward Exchange Contracts (Detail) - USD ($) $ in Thousands	Jan. 31, 2024	Jan. 31, 2023
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