Derivatives and Hedging Activities - Fair Values of Derivative Instruments in Consolidated Balance Sheets (Detail) - USD ($) $ in Thousands	Oct. 31, 2021	Jul. 31, 2021
Prepaid expenses and other current assets [Member]
Derivatives, Fair Value [Line Items]
Derivatives Assets	$ 141	$ 150
Other current liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivatives Liabilities	124	51
Designated as hedging instruments [Member] | Prepaid expenses and other current assets [Member]
Derivatives, Fair Value [Line Items]
Derivatives Assets	141	150
Designated as hedging instruments [Member] | Other current liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivatives Liabilities	104	51
Not designated as hedging Instruments [Member | Prepaid expenses and other current assets [Member]
Derivatives, Fair Value [Line Items]
Derivatives Assets	0	0
Not designated as hedging Instruments [Member | Other current liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivatives Liabilities	$ 20	$ 0