Derivative financial instruments - Outstanding Currency, Forward Exchange Contracts (Detail) - USD ($) $ in Thousands	Jul. 31, 2024	Jul. 31, 2023
Derivative [Line Items]
Notional Amounts of foreign currency derivative contracts	$ 840,271
Foreign Currency Forward Contracts | Notional Sell Amounts
Derivative [Line Items]
Notional Amounts of foreign currency derivative contracts	165,310	$ 146,717
Foreign Currency Forward Contracts | Notional Sell Amounts | Euro
Derivative [Line Items]
Notional Amounts of foreign currency derivative contracts	124,144	95,064
Foreign Currency Forward Contracts | Notional Sell Amounts | British pound
Derivative [Line Items]
Notional Amounts of foreign currency derivative contracts	17,187	20,489
Foreign Currency Forward Contracts | Notional Sell Amounts | Mexican Peso
Derivative [Line Items]
Notional Amounts of foreign currency derivative contracts	50	3,227
Foreign Currency Forward Contracts | Notional Sell Amounts | Japanese yen
Derivative [Line Items]
Notional Amounts of foreign currency derivative contracts	18,113	23,195
Foreign Currency Forward Contracts | Notional Sell Amounts | Hong Kong dollar
Derivative [Line Items]
Notional Amounts of foreign currency derivative contracts	0	2,080
Foreign Currency Forward Contracts | Notional Sell Amounts | Australian dollar
Derivative [Line Items]
Notional Amounts of foreign currency derivative contracts	0	0
Foreign Currency Forward Contracts | Notional Sell Amounts | Singapore dollar
Derivative [Line Items]
Notional Amounts of foreign currency derivative contracts	2,391	60
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	3,425	2,602
Foreign Currency Forward Contracts | Notional Sell Amounts
Derivative [Line Items]
Notional Amounts of foreign currency derivative contracts	456,153	490,020
Foreign Currency Forward Contracts | Notional Sell Amounts | Euro
Derivative [Line Items]
Notional Amounts of foreign currency derivative contracts	144,557	194,850
Foreign Currency Forward Contracts | Notional Sell Amounts | British pound
Derivative [Line Items]
Notional Amounts of foreign currency derivative contracts	138,240	132,956
Foreign Currency Forward Contracts | Notional Sell Amounts | Mexican Peso
Derivative [Line Items]
Notional Amounts of foreign currency derivative contracts	32,714	28,158
Foreign Currency Forward Contracts | Notional Sell Amounts | Japanese yen
Derivative [Line Items]
Notional Amounts of foreign currency derivative contracts	26,580	17,908
Foreign Currency Forward Contracts | Notional Sell Amounts | Hong Kong dollar
Derivative [Line Items]
Notional Amounts of foreign currency derivative contracts	1,942	7,265
Foreign Currency Forward Contracts | Notional Sell Amounts | Australian dollar
Derivative [Line Items]
Notional Amounts of foreign currency derivative contracts	9,630	9,236
Foreign Currency Forward Contracts | Notional Sell Amounts | Singapore dollar
Derivative [Line Items]
Notional Amounts of foreign currency derivative contracts	22,735	19,817
Foreign Currency Forward Contracts | Notional Sell Amounts | Taiwan Dollar
Derivative [Line Items]
Notional Amounts of foreign currency derivative contracts	8,000	8,000
Foreign Currency Forward Contracts | Notional Sell Amounts | Others
Derivative [Line Items]
Notional Amounts of foreign currency derivative contracts	$ 71,755	$ 71,830