Derivatives and Hedging Activities - Fair Value Balance Sheet Disclosure (Detail) - USD ($) $ in Thousands	Jul. 31, 2021	Jul. 31, 2020
Derivatives, Fair Value [Line Items]
Derivatives Assets	$ 150
Other current liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liabilities	51	$ 777
Prepaid expenses and other current assets [Member]
Derivatives, Fair Value [Line Items]
Derivatives Assets		594
Foreign Exchange Contract [Member] | Not designated as hedging Instruments [Member] | Other current liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liabilities	0	16
Foreign Exchange Contract [Member] | Not designated as hedging Instruments [Member] | Prepaid expenses and other current assets [Member]
Derivatives, Fair Value [Line Items]
Derivatives Assets	0	6
Foreign Exchange Contract [Member] | Designated as hedging instruments [Member] | Other current liabilities [Member] | Cash Flow Hedging [Member]
Derivatives, Fair Value [Line Items]
Derivative Liabilities	51	761
Foreign Exchange Contract [Member] | Designated as hedging instruments [Member] | Prepaid expenses and other current assets [Member] | Cash Flow Hedging [Member]
Derivatives, Fair Value [Line Items]
Derivatives Assets	$ 150	$ 588