Derivatives and Hedging Activities - Impact on OCI (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2021	Jul. 31, 2020	Jul. 31, 2019
Derivative Instruments, Gain (Loss) [Line Items]
Net gain (loss) recognized in other comprehensive income (loss)	$ 1,451	$ (576)	$ 837
Foreign Currency Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net	$ 399	$ 614	1,048
Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net gain (loss) recognized in other comprehensive income (loss)			$ 837