Derivatives and Hedging Activities - Additional Information (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jan. 31, 2021	Jul. 31, 2020
Derivatives, Fair Value [Line Items]
Document Period End Date	Jan. 31, 2021
Derivative Maturities	18 months
Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months	$ 1,034	$ (385)