Derivative financial instruments - Outstanding Currency, Forward Exchange Contracts (Detail) - Foreign Currency Forward Contracts - Notional Sell Amounts - USD ($) $ in Thousands	Jan. 31, 2023	Jan. 31, 2022
Derivative [Line Items]
Notional Amounts of foreign currency derivative contracts	$ 152,604	$ 166,300
Euro
Derivative [Line Items]
Notional Amounts of foreign currency derivative contracts	93,142	102,132
British pound
Derivative [Line Items]
Notional Amounts of foreign currency derivative contracts	27,965	34,657
Mexican Peso
Derivative [Line Items]
Notional Amounts of foreign currency derivative contracts	11,658
Japanese yen
Derivative [Line Items]
Notional Amounts of foreign currency derivative contracts	11,644	12,315
Hong Kong dollar
Derivative [Line Items]
Notional Amounts of foreign currency derivative contracts	4,180	0
Australian dollar
Derivative [Line Items]
Notional Amounts of foreign currency derivative contracts	375	325
Singapore dollar
Derivative [Line Items]
Notional Amounts of foreign currency derivative contracts	245	1,079
Taiwan Dollar
Derivative [Line Items]
Notional Amounts of foreign currency derivative contracts	0
Others
Derivative [Line Items]
Notional Amounts of foreign currency derivative contracts	3,395	15,792
Notional Amounts of foreign currency derivative contracts	855,150	614,920
Euro
Derivative [Line Items]
Notional Amounts of foreign currency derivative contracts	398,560	338,128
British pound
Derivative [Line Items]
Notional Amounts of foreign currency derivative contracts	112,945	70,869
Mexican Peso
Derivative [Line Items]
Notional Amounts of foreign currency derivative contracts	31,315
Japanese yen
Derivative [Line Items]
Notional Amounts of foreign currency derivative contracts	35,772	40,384
Hong Kong dollar
Derivative [Line Items]
Notional Amounts of foreign currency derivative contracts	148,653	49,595
Australian dollar
Derivative [Line Items]
Notional Amounts of foreign currency derivative contracts	8,821	10,026
Singapore dollar
Derivative [Line Items]
Notional Amounts of foreign currency derivative contracts	18,862	18,214
Taiwan Dollar
Derivative [Line Items]
Notional Amounts of foreign currency derivative contracts	35,047
Others
Derivative [Line Items]
Notional Amounts of foreign currency derivative contracts	$ 65,175	$ 87,704