Derivative financial instruments - Outstanding Currency, Forward Exchange Contracts (Detail) - USD ($) $ in Thousands	Jul. 31, 2023	Jul. 31, 2022
Derivative [Line Items]
Notional Amounts of foreign currency derivative contracts	$ 385,000
Foreign Currency Forward Contracts | Notional Sell Amounts
Derivative [Line Items]
Notional Amounts of foreign currency derivative contracts	146,717	$ 168,410
Foreign Currency Forward Contracts | Notional Sell Amounts | Euro
Derivative [Line Items]
Notional Amounts of foreign currency derivative contracts	95,064	88,275
Foreign Currency Forward Contracts | Notional Sell Amounts | British pound
Derivative [Line Items]
Notional Amounts of foreign currency derivative contracts	20,489	36,779
Foreign Currency Forward Contracts | Notional Sell Amounts | Mexican Peso
Derivative [Line Items]
Notional Amounts of foreign currency derivative contracts	3,227
Foreign Currency Forward Contracts | Notional Sell Amounts | Japanese yen
Derivative [Line Items]
Notional Amounts of foreign currency derivative contracts	23,195	16,688
Foreign Currency Forward Contracts | Notional Sell Amounts | Hong Kong dollar
Derivative [Line Items]
Notional Amounts of foreign currency derivative contracts	2,080	0
Foreign Currency Forward Contracts | Notional Sell Amounts | Australian dollar
Derivative [Line Items]
Notional Amounts of foreign currency derivative contracts	0	278
Foreign Currency Forward Contracts | Notional Sell Amounts | Singapore dollar
Derivative [Line Items]
Notional Amounts of foreign currency derivative contracts	60	378
Foreign Currency Forward Contracts | Notional Sell Amounts | Taiwan Dollar
Derivative [Line Items]
Notional Amounts of foreign currency derivative contracts	0
Foreign Currency Forward Contracts | Notional Sell Amounts | Others
Derivative [Line Items]
Notional Amounts of foreign currency derivative contracts	2,602	26,012
Foreign Currency Forward Contracts | Notional Sell Amounts
Derivative [Line Items]
Notional Amounts of foreign currency derivative contracts	490,020	642,295
Foreign Currency Forward Contracts | Notional Sell Amounts | Euro
Derivative [Line Items]
Notional Amounts of foreign currency derivative contracts	194,850	333,285
Foreign Currency Forward Contracts | Notional Sell Amounts | British pound
Derivative [Line Items]
Notional Amounts of foreign currency derivative contracts	132,956	78,942
Foreign Currency Forward Contracts | Notional Sell Amounts | Mexican Peso
Derivative [Line Items]
Notional Amounts of foreign currency derivative contracts	28,158
Foreign Currency Forward Contracts | Notional Sell Amounts | Japanese yen
Derivative [Line Items]
Notional Amounts of foreign currency derivative contracts	17,908	37,163
Foreign Currency Forward Contracts | Notional Sell Amounts | Hong Kong dollar
Derivative [Line Items]
Notional Amounts of foreign currency derivative contracts	7,265	67,341
Foreign Currency Forward Contracts | Notional Sell Amounts | Australian dollar
Derivative [Line Items]
Notional Amounts of foreign currency derivative contracts	9,236	9,426
Foreign Currency Forward Contracts | Notional Sell Amounts | Singapore dollar
Derivative [Line Items]
Notional Amounts of foreign currency derivative contracts	19,817	18,025
Foreign Currency Forward Contracts | Notional Sell Amounts | Taiwan Dollar
Derivative [Line Items]
Notional Amounts of foreign currency derivative contracts	8,000
Foreign Currency Forward Contracts | Notional Sell Amounts | Others
Derivative [Line Items]
Notional Amounts of foreign currency derivative contracts	$ 71,830	$ 98,113