Derivative Financial Instruments - Outstanding Currency, Forward Exchange Contracts (Detail) - Foreign Currency Forward Contracts - USD ($) $ in Thousands	Jul. 31, 2021	Jul. 31, 2020
Sell
Derivative [Line Items]
Notional Amounts of foreign currency derivative contracts	$ 186,837	$ 205,754
Buy
Derivative [Line Items]
Notional Amounts of foreign currency derivative contracts	627,421	457,903
Euro | Sell
Derivative [Line Items]
Notional Amounts of foreign currency derivative contracts	118,988	108,856
Euro | Buy
Derivative [Line Items]
Notional Amounts of foreign currency derivative contracts	337,817	207,198
British pound | Sell
Derivative [Line Items]
Notional Amounts of foreign currency derivative contracts	27,861	18,861
British pound | Buy
Derivative [Line Items]
Notional Amounts of foreign currency derivative contracts	86,778	60,397
Japanese yen | Sell
Derivative [Line Items]
Notional Amounts of foreign currency derivative contracts	15,939	15,815
Japanese yen | Buy
Derivative [Line Items]
Notional Amounts of foreign currency derivative contracts	43,281	32,009
Australian dollar | Sell
Derivative [Line Items]
Notional Amounts of foreign currency derivative contracts	934	174
Australian dollar | Buy
Derivative [Line Items]
Notional Amounts of foreign currency derivative contracts	10,462	7,682
Hong Kong dollar | Sell
Derivative [Line Items]
Notional Amounts of foreign currency derivative contracts	283	56,279
Hong Kong dollar | Buy
Derivative [Line Items]
Notional Amounts of foreign currency derivative contracts	37,556	74,714
Singapore dollar | Sell
Derivative [Line Items]
Notional Amounts of foreign currency derivative contracts	458	1,357
Singapore dollar | Buy
Derivative [Line Items]
Notional Amounts of foreign currency derivative contracts	18,448	15,982
Others | Sell
Derivative [Line Items]
Notional Amounts of foreign currency derivative contracts	22,374	4,412
Others | Buy
Derivative [Line Items]
Notional Amounts of foreign currency derivative contracts	$ 93,079	$ 59,921